You can profile any amp, but you can't profile a guitar ...
That said, there are a number of "acoustic" profiles on the exchange that have a decent sound. IMO any of these are poor substitutes for a real acoustic sound, and if you have an FRFR type system, then going straight through it with an acoustic guitar would probably yield the best results. Again, everyone's ears are different ...
I understand that the KPA will not profile the guitar. But, if you profile an acoustic amp like an AER, Genz Benz, Fishman Loudbox etc, and you played an acoustic guitar through one of those models in the KPA, wouldn't it sound like an acoustic guitar? If it doesn't, I guess I've got the wrong idea about this profiling/modeling thing. If you play through clean profile of a Fender Princeton Reverb with a strat, doesn't it sound like a strat? If you play a tele or LP, doesn't it sound like a tele or LP? I'm looking for pure acoustic tone. I use a BBE Acoustimax to EQ into a SR Jam 150 Plus acoustic amp. I can also go from the BBE into a PA for great acoustic tone. I was hoping to get the same results with the KPA.