At the end of the day, it really took three simple steps to get my drive running on my Z87A. I will repeat these here in case some else is still running one of these dinosaur MBs
From the command line with administrator privileges in Win10/Win11 run the successive commands:
(in my case Win7, as the commands would not work on Win11 for me and I had a Win7 drive laying around):
With the BIOS UEFI v2103 from the manufacturers website:
afuwinx64.exe Z87A.CAP
With the BIOS UEFI which you download from post #1 (must use version 3.05.04 to support /GAN)
afuwinx64.exe Z87A.ROM /GAN
Install: Follow step 4 here to install the drive.
The BIOS found my drive right away as PATA SM. I used Rufus to create a bootable USB Windows install with TPM turned off, booted and installed from the USB and all was complete.
Rather simple now, but I can say that after enduring the learning curve. Thank you again Hans for a great mod and great support!