I had a similar problem several years ago with a bully-boar, and we solved it very simply by rehoming the bully to a friend who had been looking for a pig in the petshop - we bumped into them there and arranged it on the spot. (Don't panic - they are very good friends and had all the piggy gear - they were replacing one which had died of old age).
After Cyril was 5 miles away there was a collective sigh of relief and everyone else went back to being happy and unstressed. Cyril was much better living on his own (!) - he just seemed to genuinely hate every other guinea pig he met.
After Cyril was 5 miles away there was a collective sigh of relief and everyone else went back to being happy and unstressed. Cyril was much better living on his own (!) - he just seemed to genuinely hate every other guinea pig he met.