I'd do it.
At 31 it's time to retire Sidey to the f50 and let one of the kids stake their claim and do the hard yards on a wing. There is no shame in that.
Honestly what would people prefer?
Sidebottom having 15 disposals running between half back / forward where once he could gather 30 or 10 touches as a clever forward where his football brain could allow him to extract greater damage per possession?
I'm going with the latter.