I have to agree (as I usually do
) with LB's logic here.
The choices here seem limited in this case (rehoming/euthanasia or declawing).
I think in this very rare case (and I say rare because most members on this site, myself included are seriously anti-declawing and pro spay neuter) I would consider declawing. (After I saw a vet to rule out a medical issue)
In terms of biting more after declawing, yup I have seen this in 2 cats that I have known over the years.
Both my cats though are declawed (adopted that way) and do not bite more than clawed cats - so you just never know.
Hope that may help - Good luck!