Efficiency and heavy weapons...
I need the most efficient way to train my Kwan Dao! Honestly now, wtf does that mean? What are you training your Kwan Dao for? The street? The cage? Come on now. Don't just apply trending training jargon to anything and everything. When I see anyone wielding a super heavy weapon, I'm impressed. That's real kung fu. That's high-level skill developed over time and hard effort.
Heavy Kwan Dao demos are seen in traditional Chinese acrobatics as an art form, just like heavy bow drawing. It's sort of like a circus strong man act. Nothing wrong with that at all. In fact, if you've ever seen one of these performances, they are pretty entertaining.
If you want to train heavy weapons, go for it. Be cautious, don't overdo it, and progress gradually.