100% this answer. I was hoping to do what OP is describing last summer, but ended up replacing nearly all the framing too. While the joists seemed OK, behind the ledger board attached to the house was NOT. Carpenter ants had eaten into part of the plywood sheathing and I’m so glad I caught it.

OP - do yourself a favor and check behind the ledger board before you start planking over the joists. You’ll at least have a chance to add flashing tape if there isn’t any already.