To make sure I understand what you mean: I can edit my font in the Font Editor and important that .deck into my project to get the edited font the same way one imports any other Resource? If so, I believe I understand how to move forward.
Yep, pretty much. Either by dragging and dropping another deck file onto your current project or by choosing a deck file when you're already inside the Font/DA mover you can move a variety of resources between decks (including fonts).
If you're editing one of the basic fonts that are always in Decker (body, menu, mono) it's probably best to copy them (inside the font editor deck, with the button option there) and give them a new name so they're easier to transfer over.
(And there's also another sneaky way to move fonts between projects. If you use a font in a field inside of the text editor deck and copy the field into your project, the new fonts it needs should come with it into your project too.)