The tongs project is one thats already proven possible because its how necromancy works.
Getting theurgy from the mortal half is pie in the sky, nehekhara and Brettonia got it from their gods.
Using a single, pure wind to manipulate a mixture of the winds is substantively different from using a single, pure wind to manipulate a
different pure wind
without letting them mix at any point.
Like, if it were that easy, someone else would have done it already. We cannot be the first wizard to have thought of this. We have a few unfair advantages (Windsage, reading the Liber Mortis), but I am still skeptical that it is possible; it seems like if it were a thing that can be done, someone else would have done it, and we have not gotten any seeded plot hooks to go after this. It is purely a brainstorm of the thread.
Using arcane energies to manipulate divine energies, on the other hand, is something that
not just any wizard off the street can do (it requires 1. a deep connection with a god, which most wizards lack 2. a god that is
okay with this sort of tomfoolery, which most gods are not). I have a much easier time believing that between Windsage, Avatar, and Ranald being more open than other Order gods to being experimented with, we will be able to develop something cool and unique, and the fact that we've had several dangling plot hooks specifically aimed at investigating this phenomenon indicates that Boney has
something planned for us heading down this track, whether that be "theurgy" or something else.
High magic and nature itself proves that winds can interact with out turning into dhar.
High magic is not "using winds to manipulate other winds." High magic is "one spellcaster manipulating multiple winds
directly without them combining in the caster's soul and becoming Dhar." That, again, is very different from the "tongs" project.