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Due to the nature of your injury you may well need more than just one remedy but if you do some research you will find it is most definitely a homoepathic remedy & the lead remedy for nerve injuries...

There is a homoepathic remedy called "Hypericum" that is good for finger crush injuries.
Wish you a speedy recovery.

Bad luck on the accident but you don't grip the sword tightly with the thumb anyway so you'll be fine :)
Use your other hand to polish. The show must go on.

Nope. The lies aren't coming from me & it's rude of you to suggest it.

Uchigumori was always used for polishing swords & rarely offered by any established & reputable sellers as a razor stone.
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As a fellow sword lover please post your finished work here :

Knives and other sharp things

I'm just generalising mate. Yes, Uchigomori are generally used on swords & Tomae stones on knives but there can be overlap into razors.

Grats.
Uchigumori is not normally useful for razors but you can update us when you try it.