If it was my animal I would insist on bringing him home. Vets offices are scary places. They smell funny and they are loaded with predators. An animal whose most keen sense is smell will certainly know that predators are near. They are also noisy. Those darn dogs just can't shut up. It is ridiculous.
Of course any surgery is risky when anaesthesia is involved but realistically tail amputation is not major surgery compared to other surgeries. Dr Emerson does very invasive surgeries (odontoma,etc) and sends them home within hours of the surgery. Her opinion is that they do much better with their own family/caregivers during that first 24 hrs. She does a surgical followup the next morning. Realistically, MOST vet offices are not 24 hr emergency centers. The doors close are quitting time and the animal would be alone throughout the night. IMO, they would be MUCH better off being observed and tended by me rather than alone. My question... observation... whose observing?
I would explain my concerns about the stress level associated with a wild animal and predator fear in the office. I would insist.
I think you're wise to have the tail removed. Make sure he doesn't remove it completely. I would leave a 2-3 inch tail. If things go bad in terms of infection you don't want the wound that close to the body. A couple inches gives you some working room.
I have a girl outside with a 3 inch tail. It is the cutest thing you ever saw. When she flicks her like nub, my heart just melts.
She lost her tail as a pinkie when she was cat caught. The tail was mostly severed but didn't dry up so it had to be removed.