To collect the top "Sky Missile", the easiest method is to use a diagonal shinespark launched from the isolated floating island, but this does cost both the time of the crash animation, and has a health cost as well.

Optimally, you can jump up from the top of the ridge, and arrest your horizontal momentum at the right moment to hit the missile location.

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 Wrecked Ship. This is especially time-consuming because the Trippers only move when they're on-screen.