I feel like it sort of violates the "exchange rate" Sburb operates on - one planet's civilization is destroyed in exchange for the creation of a universe, with the medium being a place where that universe incubates. This all operates on cosmic magic rather than an actual energy exchange rate, so it's not really proof that it "can't" happen, but if it worked Sburb probably would have it built in already, right?

It would be interesting to try it anyway and see what happens, though. Getting stuck within a vestigial infertile microsession.