'72 Scamp Can I just fix the front brakes to get it home?

This is my first post on this car It's been sitting in a shop for 25+ years and I'm now trying to get it fixed up.

Gotcha. Your plan to swap the cylinders and lines should do it. I would also have a master handy just in case.
I'd check each part before replacing it since new parts are junk so often now. With pressure on the brake pedal, loosen one of the flare nuts at the master and see if she squirts, if not then start there.
If it does, then it's likely the cylinders. Pull a drum (with no pressure on the pedal!) and you should be able to determine if the cups in the cylinder are rusted or seized in place. Sometimes a few well placed hammer taps can get you "fixed".

But like @junkyardhero said, it may be more prudent to just swap and repair everything anyway if you're planning to keep these brakes in the long term. If your plan includes an upgrade or replacement later, putting the money in a tow will at least get it home without all the busted knuckles and stab wounds from dealing with the springs ;)