If you want to trade for him, Pritchard + Gallinari gets it done, at least from a contracts standpoint (not sure if SAN would take that but maybe). I am not sure just how good of a long term solution he would be for us. 53% career FT% is a warning flag. He gets on the box score, 12 pts/9 reb with nearly 3 assists, but has never impressed me much when I see him play. He is intriguing to me, for sure.
As to the potential future contract, I think the team that has his Bird rights will have a big advantage, so if we do trade for him, we would be likely in the best position to resign him. Kind of like Grant, someone else either needs cap space or they are limited to an MLE.
In any case, I wouldn't want to give up Pritchard and Gallinari for a bench rental and I don't see him really worth overpaying to keep him here long term. The only argument that I could make would be that if the price of Grant gets too high, we would be able to go above the MLE to sign him and he could a back up plan if we are unable to sign Grant. Poeltl as a back up big , Grant replacement, would be reasonable.