I had posted on this a while back, here is an update.
With the help of another member here we had some of these door stops fabricated. I have had the plans
for several months.
I installed the stop a bit lower than I had planned due to the lack of structure higher up on the door frame. Where it is attached there is some pretty beefy structure. The door does stop positively when it hits the stop with nothing flexing.
I will most likely paint it to match when I get to a town that can mix some paint for me.
Here are some pictures.