Question regarding bare-metal hardware and SFOS Home

So -- in the olden days we could take old retired SG appliances, wipe the drive (delete partitions with Gparted, etc.), and load SFOS Home on them -- we had engineers that would run them at home for training, and to test bleeding-edge releases, etc.   Apparently the new bare-metal software installers (ISOs) for v20 and up (and maybe the old ones) detect if one is trying to do the same with a XG (not XGS) appliance.  As best I can tell the installer sees the BIOS string with the model number in it and says it will not install, due to it being a XG appliance (no doubt to keep end user customers from accidentally goofing up their appliances).   So it looks like that avenue for inexpensively training engineers is closed.... (though if someone has a helpful hint that's great too).

That said, what bare-metal hardware suitable for use in a home environment (someone without a rack, something that doesn't sound like a jet plane) have you had success with?  Not looking for crazy performance or anything, just basic home use for our engineers, etc.