@Grant Thanks for your clarify. I misunderstand your requirement before. Currently, the supported device compliance partners are in the following as you said:
BlackBerry UEM
Citrix Workspace device compliance
IBM MaaS360
JAMF Pro
MobileIron Device Compliance Cloud
MobileIron Device Compliance On-prem
SOTI MobiControl
VMware Workspace ONE UEM (formerly AirWatch)
https://learn.microsoft.com/en-us/mem/intune/protect/device-compliance-partners#supported-device-compliance-partners
Honestly, I am just familiar with the use of intune features. For how to become a device compliance partner, it is out of my scope. With Q&A limitation resources, it is suggested to try to create an online support ticket to find if there is any method. Here is the support link:
https://learn.microsoft.com/en-us/mem/get-support
Thanks for your understanding.