What if the amp department took the guts off any of the PRS amps, mounted in a head type chassis, run through a Mesa cab clone, and a tuner of some kind. From the cab clone run to a small headphone amp. All of this could be mounted in a head chassis in such a way that you minimize the interaction needed by the person trying out the guitar (like hide the cab clone, headphone amp, and tuner body). On the front of the head type chassis the user would have access to all the knobs of the chosen amp, the tuner display, and a headphone volume knob. There could also be a "visual" sheet of amp presets based on the chosen PRS amp. This would allow PRS to "brand" the experience. Seems this would be cost effective too considering everything but the headphone amp, tuner, and cab clone could be made and controlled in-house.
i don't recall if the Joe Bonamassa pedal that recently came out has a load or not, but that could be another option in place of the cab clone.