I don't.
I don't see how this is difficult. I'd personally rather JC be someone else's problem trying to force the roster fit.
In a perfect world I'd subtract both Capela and JC and trade for Ayton or Simmons, move Okongwu with a jumpshot into the starting lineup at 4 or 5 depending on Ayton or Simmons, and trade for a solid quality backup 5 and hopefully a fringe quality backup 4 in case JJ isn't ready for the backup 4 yet. OO needs to be in the starting lineup, like yesterday.
The next best scenario would be still trading both, inserting OO at starting center, and getting a great defensive stretch 4 alongside him, along with other backup 4/5s and/or draft picks. I have no idea who the potential stretch 4 is but I would have loved to swap JC for Aaron Gordon last year, soooo. Something like that.
The next best thing would be trade JC, keep Capela if you can't trade for Ayton, insert OO at 4, but you trade for a high quality big backup that's hopefully a center, and if you can add a decent backup 4 too, or draft assets for JC then that would be great.
The next best scenario is nobody offering a good enough trade package for JC and we simply keep him and continue to force the square peg into the round hole for one more season and make the best of it that we can. It sounds like I'm crapping all over this scenario, but in truth I'm really not. I know it's the most realistic outcome of our offseason. If we have to do this then really, it's fine. It's not ideal, but I'm talking about comparing it to better scenarios so obviously I can't talk about it being as optimal as those three situations above it. But I'm really not that opposed to doing this. That doesn't mean I can't point out the issues with the current status quo.
The next scenario would be just taking a half-decent package of backups and/or picks in order to get JC off the roster and/or salary dump him. This is the scenario that none of us want, especially me. I want us to make better use of our assets, so obviously I don't want to be getting shirked on the trade return for any of them. I highly doubt this would ever happen, but...stranger things have happened.
Yes, I know full well the potential offensive limitations of some of those proposed moves. No need to go into them further. I feel very strongly the rosters constructed as I have would be better teams overall.