Also, if I can get this to work, I'm quite likely to end up performing with it and so would like to be able to plug it into an amp.

Spent part of last night researching preamps, etc... and think I've settled on something like this:

https://guitarfetish.3dcartstores.co...em_p_6417.html

It will fit (just - it'll mean cutting slightly into the kerfed lining), provided the shape of the unit will conform to the curve of the guitar shoulder.