try toning down one of the  gibson acoustics with workbench

i dont see where this will do any harm to your guitar at all to string with nylon strings. and that sound is unbelievably good. a piezo pickup is almost like a miniature microphone in some ways. matter of fact they  used to make piezo mics if they dont still do you really  can put them on anything or anything on them. i have  a small thin one under the saddle of my  classical guitar.  its really just the package there in martin guitars used to put them out. i have  an extra one i boutht for a friend   thatwanted to amplify her acoustic but changed her mind. i wonder if its something like this that is used in the acoustic variax but i dont know.  and they alsp use piezo pickups on drums some times they stick on.   i wonder if thats what they use in those electronic drums to get the signal from the hit of the sticks . anyway id say  do it because i plan on doing it  if i decide i want that sound at some point. that sound was just too good to pass up. if you do  try the twelve string acoustic settings and get back to me . i always wondered what a twelve string acoustic  would sound like. and if your one of the guys who was talking about downtuning for bass  those nylon strings will be great i did that with  my acoustic once and it made a great bass line .