So, say I want to put an acoustic pickup in an Epiphone Casino. Anybody have any suggestions as to which one will give me a warm clear tone without any major surgery or messing with the regular P-90s?

Thanks in advance.
Just get a piezo bridge. It will give you a more realistic acoustic sound and you'll still have the two stock pickups for an electric sound
+1 to the piezo bridge. tone pros makes some.
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nothings wrong with it, i just want to make the most of it being fully acoustic and a P-90 is not an acoustic pickup.

and thanks for the advice, you guys rock
actually the Casino is a fully-hollow body.
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i know, but technically unplug it and it is. i just want to amplify that unplugged sound since its weak compared to an actual acoustic.