The "intended" strat is to ride the Trippers in succession to the upper missile location, so while this is tedious, it's in logic for Item Randomizer, with any item set that allows access to this room. This is especially time-consuming because the Trippers only move when they're on-screen.

Walljumping off of the Trippers is finicky, because you will easily kago inside of them. If you're having trouble with this, it might be easier to follow the top Tripper all the way to the right-hand wall, and then walljump up to it there.