Those are some unfortunate brake systems -- better sidepulls have had quick releases for decades.

One thing you could do is to adjust the cable length so that the barrel adjuster is as far out on the threads as prudent in use, then you could screw it in to open the pads when you need to install/remove the wheel. I have a feeling you'll still have to let some air out of the tire to install/remove it though. Might have to get used to that.