Replacing Bogaerts with Tulo is risky of course, but pairing Tulo with Ahmed or Iglesias is interesting to consider, as it offers some 2B insurance as well.
The Sox would have to have a trade lined up for Bogaerts. I don’t think that’s an awful idea, but I’m not sure who’d be interested in one year of him (Brewers, Mets, Padres?). He’s not a priority over Betts, and if the Sox are gonna bid on Sale/Cole next year, extending Xander seems especially difficult.
It’s a long way away, but the shortstop class in the 2021-22 offseason includes Lindor, Seager, and Correa — all 27-28 years old. I might prefer a cheap Tulo/Iglesias bridge to a 7-year Lindor contract than sign Bogaerts to the same deal next season.