I ordered the new forks from Treatland, the ones in the above post, and they should be installed by next week, so I'll be able to give a review soon. Probably after breaking them in, and maybe a short synopsis of how they are right at first.
ANOTHER NOTE: I asked for a few quotes from several spring manufacturers, giving them the specifications from the online repair manual, regarding the stock springs from the Puch Magnum ll (images in the earlier post above). One of the manufacturers responded, and there's an image of the quote below. It is obvious they can manufacture new springs for the stock forks, but it seems that ordering in bulk is the key. Also, we'd need to be absolutely certain that the specifications are correct, but as for the prices, I'm fairly confident that the prices below are comparable:
If I only order two, it ends up costing more than a run of ten, (in a separate email). As anyone can see, ordering a run of 100 is only nominally more costly than a run of only 10. So, by looking at the above estimate, it's only under $12 each per spring, which might seem feasible - this is the size for either a Puch Magnum ll or a Free Spirit Deluxe, but going by this estimate, I'd guess that any similarly sized spring would be of a comparable tariff (per spring).
They're in Brooklyn, so once my old forks are removed, I can schlep over there and show them the original springs, to get an accurate size assessment.
Maybe one of the suppliers would be interested in getting involved with this? Swapping out two springs in the front forks is a lot less work than changing the entire front end. (edited)