Great suggestions! Thanks! I am thinking maybe I should try the potty chair you posted. Looks like it might be big enough. Does the pee guard really cover the pee? Is it really high enough like the reviews say?

I will keep in mind to cover the sensor of the noisy commercial toilets. Hadn't thought about that. Peeing in the tub is a great idea too. I don't know if DS does pee when he takes a bath. Sometimes he will get out and pee within 5 minutes. I am going to try it though. I will also try covering the hole in the toilet with TP. The hole might be scaring him.

Lots of great ideas to try! Thank so much. I will keep you updated. If you can think of anything else let me know!