I've actually got a pressure pot here and a pretty sizeable compressor. But I know that isn't the answer as I don't want to warp it beyond usefulness

Thats ok for door jambs and trunk gutters,probably under side and engine compartment.

I did the underside of the floor pans on my volare with the pressure pot I have years ago in the driveway. I didn't do any of the top side with it. I built a home made rotisserie for that car.
It took me all day to do the whole thing and that was just the under side.
These blasting guys claim to be able to do a whole car on a couple of hours. That tells me their process is more harsh.
This isn't a truck that's gonna be a show piece but a daily driver for 3 seasons and camper hauler besides.

Do the big open areas yourself by sanding it off, 3M stripping discs etc., and then pay a media blaster to do the hard to reach stuff? If they blast the rocker pinch seams, door jambs, and that type of stuff it shouldn't warp. It's the unsupported sheet metal that is the concern.

any thoughts on the blasting process that seems to use a water/sand [?] mixture to wet blast ?
a friend of mine does this, and he has offered to do the engine compartment of my charger, but i'm afraid of the water/whatever mix getting inside and ruining my new carpet and other interior items.

I did my car this way, HD 3500 psi machine. I used the black beauty media, no warpage anywhere (no heat like dry blasting). I used three 50 pound bags, about two hours to do the whole outside and underhood. I tried to use my little electric machine but it didn’t have the ability to siphon the media out. Once my rotisserie is open I’ll get the car on it to turn upside down to blow all the media out of panels. I decided to go this way because the panels had very fine surface rust, sanding wouldn’t get these tiny pits out like the water-grit can. Squirt it down with Ospho afterwards to help get all the fine rust out.