I would also prefer a PF/C. But if I had to guess, they will probably get Osman. The C's and Spurs seem to have a good relationship when it comes to trades. Plus Brad Stevens and the C's seem to be tight-lipped about this kind of stuff and while there's been a lot of talk about Bey, Konchar, etc. there hasn't been too much on Osman. Feels like they'll quietly get him for two future 2nds and fit him in with the TPE.
Fontecchio is an intriguing option but I think Utah loves him and would prefer to keep him.
I know people hate him but I'd consider Drummond too. Very cheap, has had a great stretch lately btw, and could definitely be a solid 3rd/4th C who gives us 10-ish minutes and provides insurance/depth. I do think the C's need another big combo-forward or center to body up against Giannis/Embiid/Turner/Bam, etc. and truthfully I'm not sure Kornet/Queta are capable. G-Will had his flaws and regressed in 2023 but he did provide that nicely in the last two postseason runs.