I'd suggest integrating https://bellard.org/jslinux/ and running the VM in the browser if you can - then you can scale without running out of resources.
Thanks, I've been looking at WASM, for ex https://github.com/snaplet/postgres-wasm/tree/main/packages/... , it would certainly simplify everything to "download a fat file".
Have you seen https://copy.sh/v86/ ? It doesn't run as fast as jslinux but is BSD Licensed, on Github, and supports resuming the VM from a snapshot.