Full Disclosure, kind of read your specific request regarding "Epcot" wrong at first, and started to type out for HS, so I'll leave it too.
This is my experience in Covid times. I'm not aware of them bringing any characters back in, honestly don't think the rooms are big enough for distancing.
For Epcot (last in Sept 2021), you just go into the place, and they have you pose in front of the different walls (most of which are usually just queue areas) taking a few pictures at each. They throw in a magic shot on the last wall (which is the normal picture area). As this one is inside, Masks were still required.
View attachment 613593
Last did it (IIRC) fall 2020, so I'm not 100% sure if it changed, but HS shots were Star Wars Magic shots. They had 2 different types, and had you do specific poses and then the characters were added in. 1 was Storm Troopers; and 1 was K-2S0. I'm not sure if masks are required now b/c it was technically outside (the wall on the back side of the launch bay), but when we were there, they were still required everywhere, hence these pictures I'm wearing one...
View attachment 613590
Unfortunately I can't speak to the store discount since I have an AP so that's the discount I use. When Disney stores were still open, it still worked there; but IIRC there was a minimum purchase threshold. $50 I think. (just looked at the DVR benefits site, doesn't say specific stores, but it still lists it)