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I had serious doubts about my vet at first. She prescribed Caninsulin which is an icky insulin for cats. The locum vet who showed me how to shoot said I could reuse syringes up to three times and that the time to watch Neko was the half hour after the shot.

A better locum got us on Lantus and pointed me here, where I was lurking already anyway. I talked to a couple of other vets when I thought about switching. One sounded promising when she had a diabetic rescue, then I found out it hypoed and died. I kept my vet. She let me handle the diabetes side of things, and she was great at other things. We learned together about acromegaly.
We normally wait until people get to six units before testing for high dose conditions, but acrocats can have smaller doses. Ravenous appetite and gaining weight in spite of being unregulated are other symotoms.
Cosequin should be fine for the blood sugar. You might want to look into zobaline. If you look for cats with neuropathy on YouTube, see if that is what Meggie looks like.