As someone with average -13 diopter correction, I've been told by my trusted ophthalmologist that I'm a bad candidate for LASIK, due to the fact that my eyes being so long will just push the correction back out over time.

Sounds like your parent comment's doc may not have been 100% accurate with their candidacy, or—the more cynical answer—wasn't 100% honest.

Checkout laserfitlens.com. I am not affiliated, but was considering instead of the PRK that I did. Scleral lenses are can be very useful for high corrections like yours.