[snip] he may also be able to install two figure of eight caps & depending on if there is room in the body possibly install a switch to allow me to switch the top cap from figure of eight to card.
That'll make for a good M/S option, relatively simply. If the switch fits, a three-way instead of a two-way would add the choice of omni Mid as well. Unless there are complications I'm not aware of it shouldn't require additional components other than the wire connections to swap polarizing polarity on the top back capsule rather than just turn it off.
Thanks for the reminder, I need to return a Peluso P-Stereo microphone to him for service.