I thought about that for the OP as well. However, if he welds that to the drawbar, he won't be able to pin things to the drawbar anymore. If he just matches one hole on the triple ball hitch on his existing drawbar, then drills a matching hole to the second hole on his existing drawbar, he can then just pin the triple ball hitch to the drawbar when needed, and remove it when not needed. No welding required and maintains the existing drawbar for other uses. He could also rotate the triple hitch 90 degrees and drill one hole through that axis, too, so he can use all three balls. Heck, he can get the triple hitch with a hook on it, too, like this.
I added some red circles as to the two holes I'm talking about. Just make sure they line up with the 2nd holes on the existing drawbar.
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