@lcarter - I'm not an insulin user, so I won't comment on that, except to say I am assuming after all your years using insulin that you are comfortable adjusting your doses as required.
If you are still producing insulin of your own, you will have been working with that, full-time, unknowingly compensating for what your pancreas created on a day-to-day, meal-by-meal basis. I also seem to recall you saying, near the beginning of the T1/T2 dilemma, that you were struggling with high numbers for a while? Forgive me if I misremember that part.
In my observation, I notee that our bodies like to run to routines, and where our body is functioning, largely as it should, our body will "look after" us and regulate our bodies to run in our comfort zones. Sometimes this means that for a period, after reducing carbs, some T2s still experience higher than expected blood glucose numbers and/or, don't start trimming up immediately. In essence, their higher than they'd expect blood glucose numbers can be fuelled by their body releasing some of it's glucose stores.
Of course, you may in the unenviable position of having a pancreas that can produce insulin, but doesn't always do it too well, therefore almost being in a reverse honeymoon period.
In your shoes, I think I'd try to stick with Plan A a little longer and see what transpires over the next week or two.
Obviously, it is very important you keep yourself in your safe zones as far as blood glucose and insulin dosing is concerned.
Finally, just me personal view on ketosis. Undoubtedly I have been in ketosis from time to time, but it isn't something I have chased. I've more usually be guided firstly by my blood glucose numbers, and secondly the bathroom scales.
Good luck with it, whatever you decide to do.