Yes for drum sessions and live gigs I either use my SE215's or my Westone UM Pro 50s. The latter being much better, but even the 215s work ok. I just know that over time these will eventually have problems or I'll break something and will need a new pair. The Westones were like $350, the 215s are only $99 but still way overpriced for their sound. I think the Aonic 3s are in the $250 range. Since I use music buds all the time, it would be nice to have a sub $50 choice. That way I could have many of them and just put them in every bag and if something happened to a pair, no biggie just get some more.
The idea of wearing the Zero2's underneath headphone type ear protection is just not happening. It's hot, uncomfortable, and not a good look on stage.
Overall it's a small problem, I have been doing this for many years and have workable set ups. Just something I keep my eye on when seeing reviews of all the really great low cost IEMs these days. I just check their nozzle size and body fit and size. If I find one with small nozzle's and less bulky body, I'll certainly be giving them a try.