In case you want to try install regardless.
Like in nearly every Linux boot disk I've seen, there's a GRUB loopback.cfg.
These are the instructions I used.
In this case, the procedure would be (assuming the drive is GPT formatted):
put the ISO file somewhere GRUB can read it (I used an ext4 partition on the target drive)
boot some distro (any one should do, I used the old Ubuntu that was there already)
when in GRUB, hit c to enter command line
type the commands in the link (those within menuentry ... { and }, not including those two lines)
of course, replacing the filename with the correct one
confirm and proceed booting (forgot which key, should be in the GRUB screen anyway)
If you get errors, let me know. I only ever used it with the last two Sway ISOs.
If it fails at the end the same way as it currently does, sorry for wasting your time.
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