I have a 2017 Toyota RAV4 Hybrid. Over 8000 mile still on its FF. I checked the oil early on and it looked good and clean, so I decided to let it in till the recommended 10k. I also figured a hybrid is going to be less hard on the oil than the gas engine only model. I would advice to take your 2 free oil changes at least, but they are only going to do it every 10k. Giving the climate you live in, I wouldn't deviate from the 0w20. Since you mentioned using Mobil 1, you could use Mobil 1 AFE, Mobil 1 EP, or Mobil 1 AP. There is nothing like a conventional 0w20, but there are a few 0w20 synthetic blends. Since the TGMO 0w20 is full synthetic, I say stick to a full synthetic all the way through.
I think a hybrid is harder on the oil. Doesn't a prius say start off from a cold start in battery mode totally silent, then kick in the engine when needed? All the on/off, not to say running 80mph on the highway burning out that small gasser, making it become an oil user?