>>1
Why not use ObjectStore, and HTTP proxy (something like HAProxy). What's up with all the translation steps?
>>5
OpenBSD does now have vmm/vmd, it seems to have some issues, but may make sense for running personal projects. I seemed to recall there being some sort of explanation for why OBSD decided to not implement jails, the following is as close as I could find [0]. You can actually escape from FreeBSD Jails and chroots, so the explanation given there does track [1]. Further I guess it makes sense given the OpenBSD research program.
[0] https://marc.info/?l=openbsd-tech&m=101053310609914&w=2
[1] https://invidious.kavin.rocks/watch?v=hgN8pCMLI2U