So sorry about your tragic loss.
you are NOT cheating.
You have been left in limbo, and you are making the very best of the situation you find yourself.
The way I see it, it is all very simple.
We just need to control our blood glucose to levels which reduce the odds of us developing diabetic complications in the future. There are various ways of doing this, which include medications, diet, lifestyle and exercise. I suspect that there are few of us (no matter which type of D we have), who only use one of these methods.
At the moment, you have mentioned 2. In time, you may use others. We all do what we can, and use the tools we have available - and that is exactly what you are doing. And doing it well, as far as I can see.
I’m going to tag in
@Juicyj because I believe she started off with a diagnosis during pregnancy, and there is no doubt that she is T1.
If you can wrangle the antibody tests, they may shed more light, but in the meantime, please continue using the tools you have, and do it guilt free. Even if you are T2, then using insulin doesn’t make you a ‘bad’ diabetic (those don’t exist, by the way). The risk for T2s is that the injected insulin will add to the body’s own insulin causing escalating insulin resistance. That would likely show as weight gain and steadily increasing insulin requirements. Since you don’t mention that happening, it looks like what you are doing is working for you.