SCC is slow developing, its this they typically get on their ears/nose. Ears are alot easier to deal with as you can remove them and thats normally the end of the problem.
Its not unheard of for surgery to be done on the nose but its slow, difficult healing and not something id decide on lightly having met an old chap who had it done.
Mister magoo had SCC on his ears and now has a very small black dot on his nose which i know at some point is going to develop
At the moment his black dot is the stage before a pre cancerous scab so my vet has me monitoring it, when it changes to a scab you can use cryotherapy but not sure how this is for the animal, il be researching in to that.
Steroids or metacam can be helpful in slowing it down and would probably be the best course of action for you
If you edit your title it should catch more attention, theres a couple of people who come to mind with cats who have had SCC on the nose
A good place to read is fab cats
http://www.fabcats.orgIf your vet is open to trying steroids or metacam it could buy a reasonable amount of comfortable time for him