My wife has much the same problem with nerve damage in her strong shooting hand. It's confined to the last 2 fingers. She's been a wheel gunner since day 1 and lately we have been shopping for a semi for her EDC but so far she hasn't found anything that suites her in the semi class. She hasn't found one that is thin enough to fit her grip comfortably that still gives solid support to her entire grip. The semis that fit the width requirement, with rare exception, leave her pinky un-anchored.
So it looks like we'll be shopping for different carry rigs for her Ruger Snubbie instead of a semi. She has a 'custom' grip on it that has finger grooves and is extender to giver her pinky some purchase on the grip. It feels good in her hand and she hit what she aims for.
The main thrust to get her into a semi was to increase the initial ammo volume. I wanted her to get something with at least 7 round to give her 2 up on the Ruger. She's been having more and more problems with the speed loader and I thought a semi would be the way to go. But it seems she will be sticking with the Ruger wheel gun.
I guess this is just a long way of sayin' you're not alone with the grip issues.
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