its pretty unlikely that this exists. Your typical electric guitar relies on magnetic pickups -- you MIGHT be able to fit one in an acoustic guitar, but the resonance from the soundhole would be very un-electric like, and would be pretty reverby/boomy. (if you have heard the resonance from even a hollowbody electric, just imagine that times 10 -- overkill for most things, i would say)
and on the converse, your typical acoustic/electric guitar works with piezo pickups that are basically a bit of a different signal than electric guitars, and wouldnt sound quite right.
this is kind of crazy, but if you installed a roland vg-88 system onto a good acoustic, i think you would have your solution.
expensive, however.