I start the following:
Horford / Jerebko / Crowder / Jaylen / Smart
See if we can make it a defensive battle and I like that Jerebko, Crowder and Jaylen can switch with ease on LeBron and Love. What I mean by that is, we will always be at a disadvantage against LeBron and we don't really have a good cover for Love either. That said, there is no meaningful difference to me between Jerebko, Jaylen or Crowder guarding either guy, so in theory we can switch with more ease and hopefully have fewer situations with Horford or Johnson on LeBron in an ISO.
I also like Olynyk, Johnson, Green, Bradley and Rozier off the bench. Bradley brings a little offensive punch to that second unit.
We very likely lose the next two regardless but you have to try, what would you do?