I apologise if I'm repeating others here as not had time to read the full thread but, as a retired clinician who replaced food noise with MJ noise, I do have a few thoughts on this.
Any diet has a risk of regaining when stopping because the body adapts, even bariatric patients often regain weight. Bariatric surgery is deemed successful if the patient loses 50% of their excess weight and keeps it off so a gastric bypass patient who comes down from 25st to 10st but then regains to 17st is still clinically classed as a success and yet very few of us would feel a success if we regained half of our weight loss. We have to be realistic and accept some weight gain may be inevitable while doing our best to minimise it
I agree that using MJ to suppress appetite but not changing how we eat is a risky strategy and dietary, activity and mental changes will help longer term. Stopping MJ abruptly is also risky as the body may respond better to a gradual taper. I saw an article somewhere about one provider who recommended monthly reduction to the dose that is half of the "best" dose, i.e. where you lost most weight, felt healthy, etc so someone who felt great and lost best on 10mg, even if they had gone higher than that over time, would reduce by one dose a month to 5mg. They then suggested staying there for 6 months to allow the body to adjust physiologically while learning your own new "normal" and balancing life vs weight, etc before deciding whether to stay there, titrate down further or stop, etc.
My only other comment would be that I wonder if we may see different maintenance results in the trials to real life as we have a far wider range of people using it in different ways. I know it is anecdote rather than data but, of the people I know who have reached goal and reduced or stopped MJ, there seems to be a higher success rate than in the trials but only time will tell...
As for advice to the OP, nothing that hasn't been said already. Establish what calories are needed, track them, drink fluids and keep moving until you see what is practical in your life. At least you know MJ is there as an option if needed now.
Good luck