My personal SOP for left hand seat incapacitation:
(1) Summon cabin crew to pull P1 away from the controls.
(1) Remove the spare set of bars which are kept my flight case just for this sort of occasion, and upgrade myself to 4 stripes.
(2) Continue to destination or land at nearest suitable airport, as appropriate (otherwise known as 'flying the aeroplane').
(3) Log the time as P1 and sell my heroic, death-defying story to the press.
In all seriousness, passengers at the front would notice a bit of extra activity around the flightdeck door, but people at the back probably wouldn't realise anything was different until we stopped on the runway (only one steering tiller on my type, and my arms aren't long enough to reach it from the right hand seat).