Thank you, I've missed this one.

Problem is, these prepared images contain Linux binaries. Using Linux emulation in FreeBSD for OSS project doesn't feel ... right?

I am absolutely not pressuring anyone to do anything that doesn't feel right.

But FreeBSD can run Linux binaries without needing a VM or anything, using the built-in "linuxulator", and in recent releases this means it can directly execute Linux OCI containers.

Which is pretty close to running those same containers on top of a Linux kernel, when you're still bypassing much of the OS.