Alternative Build Paths

What if some items had different paths you could build into it? You choose one OR the other but still end up with the same item at the end.

Ex. let's say you're building Morello. You build the codex always, but get a choice of building the cooldown, mana or more AP part right away

Whichever one you build, you get locked out of the others and just go on to finish the item with the recipe cost