My first thought on reading that plan is that it sounds like a recipe for a squib. When I'm charging cases from my CM Lite, those boys are on a tray, and I am triple-checking that they're all filled before I move on to seating bullets. Trying to stuff brass back on to a progressive press just sounds like a dangerous pain in the ass. I know there are people who claim to do this, but I'd be a little nervous to do so.Technically you could run a progressive for the PRS stuff for all the sizing/prep for the brass. Pull it off and dump powder on an rcbs 1500/lite(autotrickler v3 if you want to be more accurate) and then seat the bullet back on the progressive right? Might be the easiest way to get around it.
You also need to remember that brass prep means decap->lube->resize->TRIM->chamfer/deburr->maybe swage. There are zero presses that can do the chamfer/deburr step, and I don't think any serious PRS competitors are going to be skipping chamfer/deburr for fear of bullet shaving. A progressive press is just not going to save you much time for that. (You can get away with it if you are blasting for 3gun, of course.)
A lot of this depends on how much F-class-style prep you're gonna be working into your PRS ammo, of course. In the end, if you can get your toolhead setup to minimize run-out, and you're OK with any variance with the Dillon powder measure, you could indeed load PRS on a 750 and probably do OK... but it's not going to fix your brass prep time, which is about 70% of the time I spent loading 223, at least.