I mean, it would start with Jaylen and Smart at least, right? Is that a price you'd be willing to pay? It seems reasonable for both sides, but not sure why Boston would go for it unless they don't want to pay Jaylen the max.
Then you either move forward with what we have (including Rozier) and a MLE guard. I suppose if you really want a younger core moving forward you could do a Horford for Capela swap - with Gordon going to another team and another small asset going back to HOU - but I don't really want to lose Horford and I'm not sure he would opt in just to be traded...even to a better situation like HOU.