I strongly recommend against ventoy for multiple reasons.
- It ships an embedded OS’s worth of prebuilt binaries that it does not build from source, and AFAICT nixpkgs still packages it that way.
- The way it actually works is by committing unspeakable crimes against early boot that I’m shocked work at all.
- And in fact, it doesn’t work reliably. It’s very common for it to simply not work with NixOS.