I'm trying it, but I'm not sure how crazy I should be. I was trying with a low tier character (that is, not Jake1) and trying to keep several strelats alive, but this is not working out at all. I probably shouldn't have too high goals since I still have only beat the stage once with 150 combo in solo.
About the strelats, there's 3 javo which mutate into them. It's possible they won't mutate if you kill them with a melee. I can't remember exactly when they spawn. I think it's around when combo is 80. Unfortunately, I don't know which melees are safe to use (that is, melees which can still allow them to mutate). I'm very sure that head stun melees will prevent them from mutating.