Boot tested #Guix System on the #MNTReform tonight!
After a few fiddly bits getting the right modules into the initrd and successfully running "guix system init" ... much to my surprise... it booted successfully on the first try!
As they say, this is not my first rodeo...
Substitute availability for aarch64 has been quite good the last couple days, otherwise I might still be compiling things!
Will push a fairly minimal example system configuration to the WIP branch tomorrow.