I think I'm confused exactly what your splicing. Would the cable still terminate to XLR? Would it split? I'm not entirely sure what you mean when you say "splicing a connector." As long as my key conditions are met, I don't exactly think I need to know how it works (until I see it). So, as I say, I just need a way for the cable to (preferably) still terminate to XLR (so it can hook up to my mixer) and be able to be converted to a 3.5mm cable (if possible) to hook into a Sony M10.
My current understanding with how your describing it is you're altering the wiring in the cable, so it requires a less of a power draw to the capsule.
Setting aside the fact that could be illegal or get you sued, the size of the capsule mount does not change regardless of its termination so I don't see how it would help in that case.
It would be all used with permission, so it wouldn't be illegal. I understand the laws behind what I want to do, and I know it's an obscure request. To think of what I'm trying to do, think of it this way...
Currently, to draw 12V/24V phantom power to power the X-X in a mobile setting, I need to use a Zoom H4N recorder. This thing is bulky and huge, due to the extremely large XLR connectors. If I can somehow draw a less voltage through the plug-in power a 3.5mm mic slot supplies, I can use my Sony M10... which is a lot less bulky which can easily be flush against a body (or better yet... sit in a back pocket).