Sorry to say, but if he is older declawing is already not an option. After around 4-8 months vets will not do a full declaw unless absolutely necessary (cancer, injury, etc) because the wound is on the toes, and cats walk on their toes. A full grown cat swinging all that weight on their surgery area would severely irritate it. If he's young enough, you now have to think about other complications that can happen after surgery. Some cats stop using a litter box because the texture hurts their feet. Sometimes they become more skittish without their main line of defense, and when scared they will be much more likely to bite. There is also now an increased chance of cancer around the paw area and a chance of a nail growing back, which would require another declaw surgery. Declawed cats also experience arthritis earlier. Sometimes declawing can't be avoided, like with neurological cats that continue to scratch themselves, but it's important to understand what you will have to deal with after the surgery so you don't end up spending money on a surgery just to surrender the cat.
Declawing does not keep cats from killing. In fact, during that small scale go pro study done on outdoor cats, it was a declawed cat that killed the most during a day. If he's indoor he wouldn't catch much anyways. Alternatively you can clip the nails yourself or use these things called cat caps that cover the nail with rubber to keep cats from harming others. Cat caps do fall off over time so you will have to buy more. Also the cat's nails need to be clipped before putting the caps on.