Suppose for the sake of argument that it really does taste the same as sugar, and with no aftertaste. Hasn't there been research showing that something that tastes sweet causes an insulin reaction the same as sugar does?
There are several studies showing that miracle fruit can actually improve blood glucose levels. Thus it could be more beneficial to diabetics than using any other sweetener that, as you said, may strain their condition even worse.
If you thought I was correct you should have written: "You are correct, tricking the mind often tricks insulin response also."
I wish you well with this endeavor; it will be a win-win for all involved if it tastes good and is healthy from a metabolic standpoint. But in my view it remains to be seen.