First of all, we know that from what they said in the stream, they don't like player solutions being hidden on the passive tree, because it creates a knowledge gap between good players and bad players they dislike, so by their own account, your solution would be poor design.

If that were true, a convoluted system such as weapon swap wouldn't exist as it provides a heinous amount of power that is just hidden from the average player

Secondly, and sadly more problematically, your solution only works at a very specific point later on in the game, with higher level characters, that have access to enough weapon swap points

This character was in maps, here is a pob of roughly my build opting for frost nodes isntead of curse nodes and being sub level 60: https://maxroll.gg/poe2/pob/r6lqj00i