Declawing is an AMPUTATION of the first digit of the toe. It's not just some simple cosmetic thing that your cat will just bounce back from.
Declawing can cause total changes in behaviour, aggression, nipping, urinary issues, litterbox issues, heck, psychological issues. It can be a traumatic and may even result in bone fragments being left in the paws resulting in chronic pain.
I don't know if your cats have known each other long, but declawing isn't going to be some cure-all. It's not going to make behaviours change for the better, that's for sure.
Alternate methods of getting pets to get along (or managing if they can't) are highly advised. Don't force them to be together. Try feeding treats near each other (start feet apart then slowly move together but don't force side-by-side), playing with toys together (around a scratching post to help promote healthy appropriate scratching, plus cats seem to LOVE playing around something, like with a stick feather or laser pointer.)
They may never be buddies but declawing won't change the behaviour.
I also recommend something that has worked for my 'problem child' who is my 4th cat of 5 coming into the household, and that's a NurtureCalm pheromone collar. He's a needy 'runt' with a Napoleon complex who'd be a better only cat. I got him as a kitten and of course didn't know this, but to try and manage things I started using one of these 2 months ago after 5 years of kitty politics. While he's been on diff meds etc, the collar was the only thing that has helped. Put one of those on Orzo, or both of your kitties, and see what happens. He/they may not need them forever, but only until things calm down. You'll just have to see how it goes.
~ gnothi seauton ~
1st goal: 350 by 2/10/14
| current weight: 363.0