I guess it depends where you live, to some extent. I seem to have been reasonably lucky. I doubt I'd try to remove a tubeless tyre from an alloy rim at the roadside either. There's a lot to be said for tubeless tyres without tubes - just plug and go unless the tyre is badly damaged. Never had much luck with Slime etc. I find removing calipers is an easy task, as is moving the pads back. Give me a rear disc any time. Much easier to maintain and more likely to work. The rear brake on my C5 is awful and I don't entirely trust it not to cause the rear wheel to lock up.
Maybe OT but the rear drum on an RE is very, very easy to fix so it is a good reliable and effective brake.
The shoes must centralise.
RE paint the cam bush to the backplate. It was not designed like that. It has locknuts and slotted holes so it can slide and centralise the shoes.
Take it off, clean it up and put it back on so it /just/ slides under your weight on the brake pedal. It doesn't want to be loose or it will adjust itself when you hit bumps in the road, but it must move.
Then the shoes centralise, you're now using both shoes and the brake point is in the same place every time. Really useful for slow manoeuvring and feathering into bends.