Will you have an actual gain on the scales though by increasing calories? If you stick to the TDEE calorie deficit calculations, you should still lose weight, just less of it each week so reduce saggy skin hopefully. I wince a little when I read about the weight losses some people are achieving week after week, it’s great to lose weight but it needs to be manageable, sustainable and healthy. But I know how addictive successful weight loss is especially if you’ve been struggling for years to sustain a loss.
The chart I used had me on 1700 cals for 1/2 lb a week loss and 1450 cals for a 2lb loss so I started eating 1400 cals when I started on Mounjaro but reduced it to 1200 for a couple of weeks if I stalled as a kick start.