Jaybird, I just took the opportunity to torture ChatGPT myself and again that wrong info came up: "Disallow Simple Pins".
I made chatgpt aware of its error and it returned 'The "Disallow easy PINs" field is not available in the Group Policy Editor for BitLocker. I must have misspoken in my previous response'
Cool system (not).
I offered a script to the users which would set a PIN only after looking at complexity. There's nothing else you can do.
But remember: even when someone has the PIN, he cannot decrypt the drive.