With Himebauch now officially (not just on Twitter!) appointed Argos offensive co-ordinator, I definitely think Chiu should be considered as a replacement as offensive line coach.
As center he was the QB of the Als offensive line, certainly knows the Trestman offense, and can certainly relate to the Als current offensive line.
His 1 year CIS experience is obviously not a lot, but it ceratainly would have helped in his transition from being a player.
The only negative I can see is now having to be the boss of a group who were formally his buddies. But I believe he would have the respect of the group.