If Finder of Paths Unseen gets Presence in the Ocean, can it make lands Coastal?

If Finder of Paths Unseen gets Presence in the Ocean, can it make lands Coastal?

Yes, if an Ocean with Finder's Presence is a land.
Whether a land is Coastal is defined by whether the land is adjacent to the Ocean. Open the Ways can create an adjacency between two of Finder's lands, allowing it to make lands (temporarily) Coastal.
Ocean's specification of "for Powers and Blight" makes this question really murky, but allowing it is much more thematic and fun, so that's the way the ruling is going. If it proves a problem later, it'll get changed then.