Hi,
I don't understand what you mean. Both solutions I propose should allow you to do what you want without the customer being mislead or being able to purchase something that he isn't supposed to, unlike what you have actually with the way you configured your product.
Now I've checked your website and I see that you've used the minimum/maximum quantity restriction of the variants so that the way you configured it could actually work. But that creates an issue on the listing with the price being used. To fix that without having to change the way you setup your product, you can change the "Which price" setting of the menu item so that it would use the unit price always, or display a range, etc. An alternative is to specify the price that you want to display on the listing in the main product. That way, the system will ignore the variant prices on the listing.