Certainly our procedure in terms of captain's incapacitation is for the FO to swap seats,
lederhosen - Are your FOs regularly checked in the LHS as well as the RHS? When everything around you is going wrong surely it is best to stay in the seat you are most familiar with? Changing seats after a captain has become incapacitated introduces a whole stack of unfamiliarity for the FO, better, I think, for him to fly the approach and landing from the seat he is most familiar with? To be honest never heard of an operator before that required a seat change by the FO if the captain went U/S.
Stop on the runway if you wish or use nosewheel fine steering to slip down a fast turn off, as suggested by Chris, above.