I made one, actually finished it a few weeks ago. On my latest touring bike, I did not want to use a kickstand like on my other bikes. Thus, I was looking for other options.

I did not want to put a U shape cradle under my sloping top tube, I was concerned it would slide on the tube. My seat stays come together where they are welded to the seat tube, sort of an inverted three legged pocket. Thus, I can stick a small diameter pole into that pocket. But not all frames are made that way, fortunately mine is.

I bought an 11mm diameter Aluminum tent pole on Ebay, to be shipped from China. And a couple trekking pole rubber feet that would fit on the ends, also Ebay from China, one for each end. Reason I got two trekking pole feet is that I used a rubber tip where the pole goes against the bike frame because I did not want a metal pole to damage the finish. The 11 mm pole was five sections, total length of about six feet. I cut each section (all five sections) to shorter lengths. I wanted it to fit in my handlebar bag, that is 9.5 inches wide. That is why I bought such a long tent pole, to get five sections so that each section could be short enough that when folded up it fits in my handlebar bag. (Wrap a rubber band around it when folded, I have no bracket for it.)

What I did was not fast, so you might not want to do it. Stuff from China often takes a month to arrive, sometimes more, so this might not be your preferred option. But I explained what I did anyway in case you can think of other material sources.

I do not have any photos, maybe I can post one later. The key here is that I am not using the U shaped thing, so if your frame is not built like mine where I can put the end of a pole in against the seatstays, then my pole would not work for you.

For my brake lever strap, I have in the past used two sided velcro (photo attached), also have used elastic bands that women use for their hair. And have also used a knotted bunge cord. The Velcro, I store it on the handlebar by wrapping it around itself.

ADDENDUM ADDED SIX HOURS LATER:

First photo, as noted above this shows my velcro parking brake. (Two sided velcro.)

Second photo shows my home made substitute for a clickstand and how it fits under the seatstay and seattube welds. (I do not call it a clickstand, I assume that is trademarked.)

Third photo shows my stand folded up. As noted above I wanted it shorter than 9.5 inchs so it would easily fit in my handlebar bag.

Additional note: One of the trekking pole rubber tips, I sanded off three sides of it to make it more triangular, that fits better against the seattube and seatstays. You can see some of that in the third photo.