@Sal87
Well done for improving so much that you don't need insulin

That's certainly an achievement and a feather in your cap.
I'm totally with you regarding wanting to reduce meds that stimulate pancreas to produce more insulin, when one already has too much in the system etc. I take a similiar medication (Glipizide 5mgs) daily. Previously I have been on 15 mgs daily, which I did manage to come off, slowly but only with using the Freestyle Libre so I could monitor my levels closely, and safely.
On Glipizide 10mgs in the mornings, I found I was going hypo by lunchtime/early afternoon so, after a while of this, I decided to reduce the dose gradually, by cutting a tablet in half (they're not coated). So, gradually, I was able to stop these regular hypos at lunchtime, meaning I didn't then need to eat Jelly Babies and biscuits, or have carbs for lunch etc. I couldn't see the logic in taking meds which caused me to eat non-nourishing foods etc
After a while, I wasn't needing to take anything but still keeping blood glucose levels in good control. Needless to say, the Diabetes nurse, at the surgery, who then told the GP, were not amused and I can only think they thought I had done this at considerable risk and without being in control. I might add, for what it's worth, I am a retired nurse, so like to think I knew what I was doing

I am now back on Glip 5mgs but I split the tablet and take 1/2 in the morning and the other 1/2 before my evening meal. I no longer have hypos on this regime and generally keep my BG levels within 'normal' parameters - by low carbing etc.
I wouldn't recommend doing this without a very good system to monitor your levels during the day and night. Neither would I recommend taking this approach unless you really understood what you were doing etc. It certainly would be best if you had the support and guidance of the HCPs but, as in my situation, I don't feel they are prepared to tread anything but a 'convential' road regarding this, and other, issues so I decided to take it into my own hands a bit.
I wish you well