Yes basically I've thought all you've said, but the good news is that the PS artist and I are friend now, and it's not likely to disappear momentarily, so while now she is drawing the new enemies, once they're finished I could ask her to do a few more couple scenes, especially since she likes to draw those. So in theory I think could swap the Cliff with Damien in Lisa romance scene, and do a new one for Lisa-Michelle and Cliff-Joshua so I would have 5 romances each:
Lisa gets = Milo, Lakadema, Tom, Damien, Michelle
Joshua gets = Shiler, Lakadema, Rebecca, Milo, Cliff
Lakadema gender is "neutral", but it (lol) looks more feminine, so I'd say it should balance everything in the end: Lisa gets 3 hot boys (Tom, Damien, Milo) + Michelle + Lakadema while Joshua gets 2 hot girls (Rebecca, Shiler) + Lakadema + 2 hot boys (Milo,Cliff). Even if Joshua would become the alien lover this way!
(not that Shiler or Lakadema looks ugly or anything)