little late on this but you might look @ options
http://www.kksound.com/pureclassic.html
The newer (new to me as I started with D'Armond mag pickups) thin film transducers are an improvement, to my ears, over tradition mag and piezo p/u's. I own four systems (with various configurations of tone volume control, pre-amps, etc.) from K&K and am satisfied (by and large) with all of them. I modified a damaged Ovation (not my favorite guitar design) as, among other things, a nine string and used the 4 tab classic pick up. I do not typically use it to record but it for some specific things it works well live.
While I tend to glue the tabs it is possible to install them with no permanent mods to guitar at all. The banjo output jack will fit through an end pin (if guitar has one) hole and while ugly and awkward the wires can be draped through the sound hole as a compromise.
I used a lot of different systems and generally speaking still prefer to mic guitars . . . after that a combo k&K plus internal mic with external preamp that permits blend, etc. but I've been satisfied with the K&Ks for the things I've used them for
good luck