No, not all. We only, or at least I did, just drifted a little off-topic. From my personal experience, one being "reborn" as something other (all kinds of "other, including, but not limited to ubi) is not just possible, but is regular occurrence, I'd even say, part of the natural processes of the "greater reality".
While I don't have very close relationship with Lilith, ubi is not exactly exclusive to Her realm. There are some other places populated with fun people of the similar kind, even if ubi from other places may slightly (or a lot) differ in character, so to speak. And just so happens, I did spent some time in one such place, back in the day, when my AP/OBE practices was at the peak. And because of reasons, I can neither confirm nor deny that at least some of the people there had human lives before. But I can confidently say what you want, is probably one of the most realistic (or one of the most achievable) desires I've heard in this forum in all the years I've been here.