I can also confirm it works on iMac 11,2 upgraded with Quadro metal card
View attachment 1657899
A couple of notes on the install process:
- I had to boot on Catalina Loader in order for stage 2 (OTA pre scripts) to work, and later chose the "Install Macos" partition, otherwise I got forbidden symbol.
- Have to install dosdude post install patches right after stage 3 reboots, or the systems gets unbootable (boot loop) on stage 4.
About this install, today I noticed it wiped my Windows UEFI boot from the EFI partition, making my Windows 10 unbootable (It doesn't show on the boot picker). I can't be 100% sure this install was the culprit, but I can't think of something else I've done that could delete the EFI windows folder.
Anyway, I'll take a closer look on next OS upgrade to confirm this.
If someone happens suffer the same missing EFI windows boot, here is a quick and easy fix that worked for me.