That’s a cool project you have going. Few of the users including my self don’t use IPA to clean the models but use a water based system instead.
IPA can distort thin and fragile models so if your using that then carefully snip the supports after post cure and use 2 baths as Formlabs suggests.
Water based system you can just take the supports off a fresh print when they are soft which reduces chipping. The parts don’t distort or become brittle if left in YM because it doesn’t soak into the model.
Post curing in either case is quicker when the part is submersed in clean water under a uv light. I use a reptile light and usually takes about 20 min or so, others use nail curing units. Without using water it will take longer.
There is a new formulation of YM coming out that is much more potent, you should be able to use a toothbrush or something similar to scrub up the models and not really need an ultrasonic bath. Heating is also not necessary as long as the YM is room temperature so a cheap ultrasonic machine would do the trick if you have one.