Electure, 1999 code 250-30, and all others for the 30 years I've been around, the grounding electrode must be as near as practicable to the transformer. If there is NO way to bond it closer I can't off the top of my head find fault (no pun intended) with your method. If there is a way, you would be in violation not to use it, including a ground rod, etc.. I'd have to consider the capacitance of the method, I really don't like, at first blush, it being mixed in with phase conductors of the primary side, too danged much choke for fault purposes for my liking.
