Dear Maybe You Can Relate,
Fellowship of fashion and design, assemble!
Suppose one had an idea to invent a pair of shoes that would mask one's height, by making it look like one's height came from the shoes instead of your shins (let's say there would be a fake high heel and one's heel would actually be cleverly hidden inside it).
Not looking to mass market them (cuz then everyone would know the secret!), but how could one get a pair made (with some level of quality, wearable and passable at least) for a reasonable price?
Disclaimer: I have no idea what a reasonable price is for this quest, let's say under $200 (but up to $600 just for kicks)
These are called "lifts," and a variety of companies make them. This Google search returns a lot of results, so you have a lot of options to choose from.