Share 'bridgeplate pickup, for '58 Martin 00-17?'

A customer has a lovely old 00-17. He'd like a K&K mini installed, but the bridgeplate is too small, I think(very little plate open in front of the pins: plus the front edge of the plate is very close to the 'x').  Can anyone suggest a suitable, similar internal pickup that will fit? I did temporarily install a Baggs M1A soundhole p/u, which does sound very good, but the owner doesn't want a…