The Ultra Tonic would work perfectly in this situation. I has a spare solder pad for connecting any 2nd passive pickup to the RING connection in the TRS jack.
I personally have this on my beloved Gibson AJ. It has a P90 in the soundhole that I put in, plus an Ultra Tonic. I use an external TRS breakout and an A/B selector to choose between the acoustic sound (Ultra Tonic) and the electric sound (P90).
It's the best of both worlds, and I regularly perform "I Feel Fine" as well.
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