Necessity is a mother...Nice fabrication indeed. Back in the day when I had issues keeping my mic stand upright with the boom and the gooseneck, I simply put a weight lifting weight over the base. The mic stand threaded right through the "bar hole". I then put a collar clamp (like a memory lock) on the upright so I did not have to tighten the upper section. That way I could simply swing the mic in and out of position with a flick of the stick.
Thanks! Your barbell solution is a great idea. I have used a sandbag for years thrown over the 'outer' leg of the mic stand to keep it from tipping over. As you know, you need to extend the mic boom quite far to reach over everything. With the added weight of the harp rig, it was even more of a problem. Putting the tom stand base on it worked fine, though. The legs have quite a large footprint. I keep one leg of the base running parallel underneath the boom and it stays steady as a rock.