How is transitioning from RHS to LHS on AB any harder than swapping from driving a manual transmission in the UK to the rest of the world, or vise versa? Or even RHS to LHS on any non-siudestick aircraft? You still have to swap hands for the throttle in the latter case.
To maintain, say, a RH sidestick in the LH seat would impose some pretty bizarre cockpit constraints, to the extent that it would be hard to conceive of using a single set of engine controls, indeed the whole centre console almost needs duplicating. I doubt it could be made a practical layout.