It is fairly traumatic for a rabbit to have its teeth trimmed, especially if it has to be done repeatedly throughout its life. Instead of clipping the teeth, a vet can use a drill to grind them down and shorten them, but that would take longer and would still be hard on the rabbit. And repeated trimming can lead to other problems, even a shattered jaw in extreme cases. It’s too bad that the vet didn’t remove both lower and upper front teeth during surgery. The best plan would probably be to go ahead and remove the upper front teeth now. A rabbit can cope with missing front teeth and can still eat well. You may have to cut up the veggies/greens into smaller pieces for a rabbit with no front teeth, but they can draw in food and chew it with their back teeth. There is a rabbit at the Sanctuary where I volunteer who had severe malocclusion and had all his front teeth removed several years ago. He is still going strong.