@codemonkeymike did you try https://theapplewiki.com/wiki/Checkra1n their site says they have experimental support for T2 processors.
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Another reason to hate #Apple We're seeing more 2018+ MacBook Pro/Air donations — but Apple's T2 chip means even after iCloud sign-out and reset, the firmware stays locked to the original account. -
Another reason to hate #Apple We're seeing more 2018+ MacBook Pro/Air donations — but Apple's T2 chip means even after iCloud sign-out and reset, the firmware stays locked to the original account.@codemonkeymike I am interested to see if you have tried this method
https://mrmacintosh.com/how-to-restore-bridgeos-on-a-t2-mac-how-to-put-a-mac-into-dfu-mode/
And
https://mrmacintosh.com/how-to-remove-mac-firmware-password-new-way-if-you-have-a-2018-2020-t2-mac/
You need a second Mac that works and you control the one with a firmware lock using Apple Configurator. I have converted Apple Macs to run Linux but all of them have been 2017 or earlier.