I have to tell you, I would not leave the poor baby in pain. It negatively affects EVERYTHING, dulls the appetite, etc.
I have discovered that the infant ibuprophen is AMAZINGLY effective on these guys, and when I dose for people here on the board, I ALWAYS underdose because it does such a good job - I wish it worked as well for me! I helped a person here a couple months ago who's squirrel had developed a huge abscess on the chest. She was in a lot of pain and needed to wait until the abscess was ready before trying to lance it, meanwhile, her baby was dumpy, depressed, not eating, staying in bed all day. ONE one half dose of infant ibuprophen (and our dosing regimen is for 1/3 of the actual recommended dose, which I cut in half) and 15 minutes later she jumped up, did zoomies for a bit, then ran into the kitchen to park herself in front of the fridge to beg for food. Her mama calls it "the feel good juice" and it allowed her to get to where she could get rid of the abscess and on the road to recovery while not being in any pain. Given that it can be dosed a lot more frequently than meloxicam they can be pain free all day instead of just for a few hours after the dose.
The second thing, in addition to the MBD treatment, is to order a bag or two of the Henry's food for him. It is a supplement AND a food and will provide a lot of the replacement calcium he needs. My wilds love it - any time Zeke doesn't eat a block or part of one I toss it to one of the outdoor guys and they snarf it right down. The nuts are okay to induce him to eat but they are working directly against any MBD treatment you are trying to do.
https://www.henryspets.com/diets/ Any of the first four products - mine prefer the Hazelnut and the Picky Bites.