So, to conclude, attached is the picture of the result, using the suggestions in this thread.
Olympic was a little disappointing on a couple of points, although only a little.
Point 1, the small bolts were not long enough to go through the tube. So, I managed to attach using only tube wall, by inserting bolts from the inside. This prevents possible squeezing of the tube and ripping the circular weld, so it's probably a good mod on their part. But now I cannot even remember by what magic I accomplished it.
Similarly, it was pretty insane trying to get the big bolts threaded through nuts, but at least that was expected. I solved it by laying up the duct tape in many layers.
Point 2, they changed the design of the bracket. Where the old pictures in their instruction show a solid box bracket, they have a flat metal shape now, which bends. Result is a bracket that is not tough enough to support a Hi-Lift. So my jack actually rests on the recovery hooks and the bracket just generally keeps it in place. I'm not very happy about this, although the arrangement survived some decent trails.
But what most irritates me about Jeep mod products is the endless skimping on the hardware. The ARR mount was like that with missing washers, and now Olumpic bar is too. In fact their own instruction sheet contains inventory which says "4 - 6/16" Hex Nuts". But there weren't nuts in the package. What was I supposed to do, pay to return the whole enchilada to Quadratec? Of course I sighed and went to Home Depot. Of course they did not have matching blued nuts, the best I was able to find was zinc-plated.
Not that Olympic care, apparently they stopped selling the product, which is too bad. I like it, and it works. But it could be quality.