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I'd like to buy the game for 10 bucks and then later have the option of buying the cartridge... with a 10 bucks discount.

I've searched a bit and it doesn't seem possible. But it would make sense.

it still costs money to produce the cart


Yes of course.

If I bought the ROM for 10$ and then the cartridge for x - 10$, I would have paid full price for the cartridge.


this is actually a good idea


Sorry for the late reply,
Why don't you take directly the physical version,  the ROM is include. You can check on the online shop of our official partner Broke Studio: