Bathtubs are even harder as far as the lift - same mechanics with even more restrictive fender. The rears are a pain to change even in the garage. Consider two small bottle jacks and some wood blocks, (including of course a tire wedge), working as a relay team. I understand your point on weight, but remember safety too. You're going to have a high lift on who knows how stable a roadside surface.
Another alternate that I cringe a bit on is a foam aerosol flat fixer, but then you should clean that crap out of the wheel & tire later.