Alright, I figured this idea couldn't be all that novel but thought it might be worth posting anyway.
I forgot to mention in the OP that I realize it's not feasible with nymphs being nearly impossible to come by, but at some point there will probably be a way to do it. I did want to get some input about the upped vs. un-upped nymphs though. I was going with un-upped on the pretense that I might end up in a scenario with two nymphs and only one angel, and having them un-upped would allow me to give my angel +10 that turn. Do people think that is too situational, or is the extra +1(-1) for each upped nymph worth it in the long run?
After playing a bit more, I really like this. Both creatures are too large for Otys to eat, even with momentum. My healing covers RoF from being a real threat too. Ice/fire lances are problematic, drain life much less so, as are stall tactics (turtle shield, congeal).
Thanks for the input though, Puppy. For now I'll just mess around with this in the trainer and dream of nymphs (although I was lucky enough to get one Gravity Nymph from the Oracle one time!)