Memory Integrity disabled even after resolving driver issues

I had what seemed to be a pretty common issue with incompatible drivers preventing activation of the Memory Integrity feature of Windows Security. This went on for a shamefully long time, probably over a year, until I finally got around to removing/updating* the offending drivers yesterday. The scan for driver compatibility no longer identifies them as a problem, but the incompatible drivers check is somehow still preventing me from activating Memory Integrity, even though it finds nothing wrong. I have tried several other approaches (listed below), and nothing worked.

*I am aware that Microsoft does not recommend removing the incompatible drivers in order to solve this issue; in one case I updated the driver using the distributor's provided tools, and in the other case it was a redundant, old driver that had already been updated (see summary further below).

SYSTEM DETAILS

Dell Precision 5520

Windows 11 Pro

Version 22H2

Installed on 10/5/2022

OS Build 22621.3155

Windows Feature Experience Pack 1000.22684.1000.0

Intel(R) Core(TM) i7-7820HQ CPU @ 2.90GHz 2.90 GHz

Installed RAM: 16.0 GB (15.8 GB usable)

System type: 64-bit operating system, x64-based processor

Pen and touch Touch support with 10 touch points

THE [ALREADY REMOVED] INCOMPATIBLE DRIVERS:

ftdibus.sys

FTDI

Import date: 10/4/2022

Driver date: 8/25/2014

Driver vers: 2.12.0.0

Published name: oem4.inf

ftdibus.sys

FTDI Ltd.

Driver vers: 2.12.0.2

Product name: FTDIChip CDM Drivers

xusb21.sys

Microsoft

Import date: 10/4/2022

Driver date: 8/12/2009

Driver vers: 2.1.0.1349

Published name: oem80.inf

HOW I REMOVED THE INCOMPATIBLE DRIVERS:

I resolved ftdibus.sys using two downloads from FTDI on their website. First, the GUI version of their CDMuninstaller, which was very simple to use. I confirmed that the driver was removed from C:\Windows\System32\drivers. Then I used their CDM212364_Setup.exe which was supposed to install available driver packages. I can't tell if it actually worked though, because after I accepted the terms and conditions and saw the little install animation run for a second, it just sort of blinked and closed without reporting a success. I tried twice. (I'm not super concerned about this driver anyway, and I don't know what USB deviced it was for. I have many that I will probably never use again.)

After trying and failing to use pnputil /delete-driver in Command Prompt, I removed xusb21.sys by simply finding its folder in C:\Windows\System32\DriverStore\FileRepository and noticing that there was also a xusb22.sys, probably the new version. I cut and moved the whole xusb21.sys folder out to a backup location. (This is just for xbox controllers or something, which I don't use.)

So, the incompatible drivers were removed, and they disappeared from the report in Windows Security settings. However, this didn't allow memory integrity to be activated...

THE PROBLEM NOW:

At this point, the Windows Security icon in my system tray and the "Device Security" item in my "Security at a glance" page in Windows Security went from being marked with a warning to a green checkmark. So, looks good. But the option to switch on Memory Integrity is still switched off. When I try to switch it on, it checks for driver incompatibilities, grays-out the switch and then gives the same old message of "Resolve any driver incompatibilities" along with the option to scan again. But if I click the link to review said incompatible drivers, it's empty. Because I already resolved them.

This has not changed at any point since I removed the incompatible drivers and then went on to try all of the below additional methods.

WHAT ELSE I HAVE TRIED:

• Checked for driver updates or issues in Device Manager, saw nothing of note
• Downloaded Autoruns64 from the Microsoft website and ran Autoruns64.exe as an administrator to check for other drivers with problems. I disabled any that were highlighted. There were a few, five or six. I deleted one that gave an error and couldn't be disabled.
• Uninstalled a lot of software that I thought might be related to USB peripherals I no longer use and could be related.
• SFC /scannow in Command Prompt running as administrator; didn't find any issues
• Checked for updates in Windows Update, Dell Support Assist, and my video card updater app. Everything is up to date.
• Reset the Windows Security App
• Used the Registry Editor to add a new DWORD named "HypervisorEnforcedCodeIntegrity" with value set to 1, per some random instructions I found.
• Checked that virtualization technology support was enabled in BIOS; it was already enabled, but "Trusted Execution" was not enabled, so I enabled it.
• Rebooted several times throughout this process
• Eventually thought to try running Autoruns.exe instead of Autoruns64.exe and found that it was showing one additional highlighted driver, BlueStacksDrv_nxt. A moment later the highlight went away, but it still said (Not Verified) under publisher, and I noticed that the description uses the relevant(?) term "Hypervisor," so I went ahead and uninstalled BlueStacks completely and the driver was uninstalled as well.
• Rebooted

Regedit, BIOS, and the last Autoruns change were the last things I did, plus reboots in between. No improvement that I can see in Windows Security.

Any ideas to try would be much appreciated. I am pushing myself here and obviously trying some things already that are inadvisable for an amateur to mess with, because I really want this to work--it sounds like a somewhat critical security feature.