I think this makes sense but I wonder if firecracker would work better than vagrant for this? I haven't used it before, though. I guess it might if you are trying to run gas town level orchestration.

Firecracker can solve the kind of problems where you want more isolation than Docker provides, and it's pretty performant.

There's not a tonne of tooling for that use case now, although it's not too hard to put together I vibe-coded something that works for my use case fairly quickly (CC + Opus 4.5 seemed to understand what's needed)