Hi, never seen those restriction before however, never flown wit AL. Do they know it's a bike? As airlines usually accept that sports equipment is different dimensions than regular suitcases. Does that mean no ski's? The measurements you gave I haven't checked (being lazy) are you able to remove the wheels, fenders (mud guards when you get over here
) racks, drop the handle bars etc to get anywhere near them?
If not fly with someone else. Little chance of hiring the kind of tourer you want and really you need your own bike as you know it and can carry the relevant spares, tools etc.
It's spring here already and we are snowed in.
You'll have fun enjoy your trip. Pm me if you get any problems over here I'm in the south of UK