...and to reinforce 411A's comments. Try a pilot incapication in the sim. with cabin crew. You may well find that cabin crew have been trained to (immediately) try and move your incapacited colleague away from the controls, without regard to the deck angle. Depending on the size of the pilot and the seat travel you may well find now yourself out of control as your former colleague slides into the control column. But should this not occur, instead you may well end up conducting a rather pointless and longwided checklist reading lesson just as you re-learn the finer nuances of "side-in-control logic" and other such malarky. Tell them by all means (you will probably have to have the cabin secured earlier than normal anyway) and brief then on what you intend to do and what it expected of them. But you do the flying and the checklists and they stick with what they are good at.
PM