Just catching up with you and Indigo. I had a chuckle that your vet wanted him more regulated before doing a dental.Neko's first dental she started the day over 400 - which wasn't unusual for her then. Maybe your vet would be willing to refer you to a dental specialist who is much more experienced giving dentals to older and diabetic animals? Indigo's numbers are a lot more regulated than many cats I've seen have dentals.
Go with your intuition on the shot before dental. Most of the time Neko had aneasethesia she had a half dose. One dental I didn't trust her and gave a token dose - she got 1 point away from a reduction on their AT at the clinic.![]()