Connie,
Don't be intimated by Lantus, first of all cats canand do go into remission on Lantus that aren't given insulin under 100, my Maxwell is living proof of that.
From what I have seen even with those that do have to shoot low to stay low well that is what the board is for so we can help you figure out if you need to give insulin and at was dose is safe to give. But it is also one of those every cat is different kind of things, if they are going to go OTJ they are going to do it their own way...Some are going to need to be weaned off before they can hold normal numbers on their own, some are going to need to be microdosed, some are going to get down to a certain dose like Sara's Duncan and just go off (anti-jinx). And well others always get insulin only the cat's pancreas and the cat know how it happens. That is why we have the 14 day trial, if they don't pass the trial, you just go back and try again.
Do I think Musette is ever going to go OTJ...probably not because like you I've seen her medical history, but that doesn't mean I'm not going to strive for it for her, and give her the best possible chance at it. If she does, she does, but if she lives out her days as a well-regulated healthy and happy diabetic cat then that is fine by me too.
Mel, Maxwell, Musette & The Fur Gang