I cracked open the package, and it seems almost straightforward, except for two complications: it bundles a compiled version of GRUB for i386 and amd64, as well as some other compiled tools. I think any working package would need to rewrite that to use a version of GRUB installed already on the machine: but I don't know enough about Debian packaging or boot systems to comfortably rework this for full policy compatability (ie, being able to build and use the arch-appropriate GRUB version).
Some possibilities would be to (somehow) download the Grub package for the appropriate arch, and use the compiled files from there during runtime. AFAIK, the software needs to download from the internet anyways for its core functionality. Guidance would be much appreciated. Salsa link is: https://salsa.debian.org/CalumMcConnell-guest/multibootusb
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