I didn’t get the Pelagia-appreciation gene, but I think
Larisa is very nice. I especially like that, while the name contains softer sounds and has a gentle feel, it’s meaning is one of profound strength. Perhaps this is why the combination,
Larisa Hedy, came to mind. It isn’t anything like your pairings, but I thought you might like it. My favorites from your list are
Larisa Marianthe and
Larisa Amalthea. :)