Cool, so the card is too weak and too strong at the same time.
Seriously dude, I already told that I view it as a wacky idea so it being overpowered with Highway is really my last worry.
About your question about why anybody would overpay for this, you don't seem to get the basic idea of the card although it was your suggestion: make it more flexible such that it is decent for Province gaining as well as Alt-VP.
You can e.g. pay 5 to later gain a Province, pay 6 to gain 2 Duchies/Dukes or pay 7 for 3 Gardens. So contrary to your claim it seems to be pretty decent with Alt-VP wherea you normally just get one Duke when you hit 7.
I totally agree that the card is wonky but not because it has a few more words than the average Dominion card. The amount of text isn't correlated with card complexity by the way. If Dominion featured card drafting like Mystic Vale this could be done with virtually no text and would then appear as the simple thing that it is: 5 for 8, 6 for 10, 7 for 12, etc.
Kudasai's wording does indeed have the problem that the info is not stored on individual cards yet applies to the entire pile (we already discussed this previously) which isn't a big thing with Victory cards as you will mostly go for the same values each time you buy Dead Marshes anyway.
Your version has several problems. First of all, it clearly needs a 1:2, not a 1:1 ratio. Second, your version is restricted to gaining 2 cards which fixes the Highway issue but makes the card significantly weaker with Alt-VP. Third, your version is more about accumulating and removing tokens which might totally be a thing but doesn't really have to do anything with what I am aiming for which is using the overpay and token mechanism to make the card flexible without having to print out 36 Victory cards and introducing some weird rules that deals with the pile size of a "Hydra" pile (like, there is only the base 5-8 card in the SuUpply and when you overpay for it you put it into card nirvana and instead gain a 6-10 or which is a non-Supply card) which was my first idea until Kudasai came along with something far better.