How about Perry Jones III rather than Turner (I suspect Philly would resist taking Turner back)?
Big men and foot problems are a dangerous mix but would Danny take the chance while waiting another year for Embiid? Obviously Joel would not be available for these assets if he were healthy now, but would Philly pass the gamble off to another team while recouping young player(s) and our #1? It would solve our roster glut and give us a shot at that “franchise” center. It is risky but I rather think that poker player Ainge would pull the trigger and take the chance that our training/medical staff could revive Embiid's career.