If you want, you could always start it up yourself, put the kernel and any odd deps in a portage overlay, and see what happens. I for one welcome the project and would enthusiastically support its return.

Though I recommend switching to the hardenedBSD kernel instead. It would just feel... Right seeing that come home.

In theory, it should be fine with a non-systemd init. OpenRC is tradition in Gentoo after all, and OpenRC is from BSD.