I wouldn't worry about R12 bye players, unless you're already on the heavy side. There aren't that many good R12 players that teams won't be able to field 21/22 players for a best 18 score.
Most will have the following premos out: See below (filtered out dead rookies etc)
Forward: Dunkley
Ruck: Marshall
Mid/Forward: Gulden
Def/Mid: one of Sinclair/Ryan or Steele/Neale/Brayshaw
That's only one per line, easily covered with a functional bench with people owning approximately one of Ashcroft, Willmot, Mckenna who can be culled anyway. I think R12 is going to be a very high scoring round for a bye round (bit of self perception bias as you can see I've only got 2 of those).
So yeah, I wouldn't write of sharp if you think his reasonable scoring keeps him in his team. Run him until R16 when you can pickup your last piece of the puzzle like say a DPP Walsh etc.
Cheers
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