I set off fine, consciously making sure to use my left hand, but he thought it was hilarious when we got a little way down the road and I accidentally whacked my right hand into the door!)
I did that when we first came over, also reaching over the left shoulder for the seat belt!!
Ah..... That's not a problem I've ever had!
I've never driven a manual in the US, so shifting with the other hand was one thing that I didn't have to adjust to over here. I imagine it will be weird if I ever drive a manual in the US though!
Only for a day or two until you adjust though. It's really not much different from getting into a different vehicle and having to remember that, say, the headlight dimmer is on the column whereas on your last car it was on the floor, or that the parking brake is between the seats instead of under the dash. You'll most likely reach for the wrong place a time or two at first, but you'll soon adapt.
Look, if it's a dire emergency, the least of my concerns is going to be whether or not it's illegal. I mean, honestly. What will the authorities do should they even find out? If it's a genuine emergency and they want to play hardball, so be it I guess.
I think the charge would be "Driving otherwise than in accordance with a licence." That covers people on learner's permits driving unaccompanied, driving a vehicle which is heavier than that for which you are licensed, or a whole range of other violations.
There
is actually a defense of necessity in English law, i.e. saying yes I broke the law but only because I had no reasonable alternative at the time, but I think it really has to be an absolute dire emergency with no other possible course of action for that to be accepted.
But as you say, you have to weigh up the chances of anyone ever finding out in that odd emergency, and could always plead the "ignorant American" if it ever went to court, with mitigating circumstances that even though it's no longer valid in the U.K. you were fully licensed to drive manual and indeed could have done so perfectly legally for your first year here.