As far as doctors et al are concerned, side effects in general do not kill, and patients can learn to live with them and adapt as necessary. For instance my doctor knows about the risk of SGLT-2 med for possible DKA, but was not interested in my ketone reading of 8 mmol/l since I did not need a blue light taxi on that occasion, so I adapted, it seems. He refuses to take me off that drug, and wants to increase the dose.
I control what goes into my tummy, so I have the last say in that respect. Got boxes of the stuff in the cupboard.
But its a bit different with insulin. That is one med that should be tweaked as necessary to get the best fit - it will never be perfect given today's technology, but it can get pretty good if the doctor would work with the patient properly. Now I can see why you are Sad if that aspect of care is not happening for you.
Your dental work being recent, your gums will be sensitive for a while, but they should harden up and although not able to bite or chew, it should allow you to eat soft foods again. As my father-in-law used to say - you learn to gum things to death coz he only had one single tooth in his head.
It would suggest that you need to sort out the insulin problem asap. My understanding of insulin is that the dose should match the food, not the other way round. So your currrent liquid diet is not IMO a long term solution and you do need to consider upping the carbs (for soft eating) and adjusting the insulin to cover that increase, Maybe only puree the meat then?