Comment by Imustaskforhelp

I had been in a similar boat and here are some softwares that I recommend or would discuss with you

https://github.com/libriscv/libriscv (I talked with the author of this project, amazing author fwsgonzo is amazing) and they told me that this has the least latency out of any sandbox at only minor consequence of performance that they know of

Btw for sandboxing, kvm itself feels good too and I had discussed it with them in their discord server when they had mentioned that they were working on a minimal kvm server which has since been open sourced (https://github.com/varnish/tinykvm)

Honestly Simon, Deno hosting/the way deno works is another good interesting tidbit for sandboxing. I wish something like deno's sandboxing capabilities came to python perhaps since python fans can appreciate it.

I will try to look more into your github repository too once I get more free.