Heated washer fluid linksHere's a couple solutions that could be retrofitted to any car...
Microheat heated washer fluid system
You might use that in conjunction with a line with a sprayer mounted on the wiper blades (I know GM cars used to be this way). Here's something similar.
If you use a wiper-arm mounted sprayer, the heated fluid goes straight to the glass, as opposed to being exposed to the air first. This also allows you to use less fluid in my experience as you can deliver the 'shots' of washer fluid heavier in the more thickly frozen areas, vs the hood-mounted type.
I'd only be concerned about using fluid that's TOO hot on the windshield as it could cause it to shatter or crack, obviously. Generally though, but the time the fluid moves through the small diameter supply line it also cools
Some newer E65 BMW's use a similar configuration along with heated lines/nozzles that keep the fluid warm right up to the point of delivery.
It wouldn't be hard to get some of that rubber supply line from Pep Boys/Napa/etc. to plumb the dispenser line up onto the wiper arm (use some small zip ties to hold it in place). A little ghetto, but less ghetto than a mangled bumper, etc...
There's also a number of products like Zerostart which keep things from getting so cold in the first place, at least overnight.