Not gonna lie, it would hurt losing the depth required to get Grant or Barnes. DJJ has been really good for this team. Brown has been solid lately as well. The trade options that work salary-wise are the following:
Coby + Brown + DJJ
PWill + Coby + Brown (+ one low tier filler, haven't checked)
PWill + DJJ
Id prefer the last choice tbh. We don't even know if PWill is going to return this year. Keeping Coby would be really nice given his recent production, unless you think it's a fluke.
Barnes fits better offensively IMO, but I love Grant's length defensively. When he was more focused on being a role player like in Denver, he was efficient and played better defense. Could be a very solid fit.