The Jazz had a terrible record without Gobert, so I don't know how great that insurance is.I think Bjelica would be a really nice fit. I also think his playing time and production would go up in our lineup that lacks a real stretch big (unlike Minny).
However, losing Favors and bringing in Bjelica as his "replacement" would scare me. I'd be much more comfortable retaining Favors as the starter, and playing all 3 bigs in 26-32 minutes a night range (including Crowder). Rudy seems to miss 10-12 games a year with minor injuries, and it's huge to have D Favs as a "backup C" in those scenarios.