I was also thinking about telling someone to make me one, but think I'll just order more of them and
sell the rest to people interested in them - hope it will level the shipping costs somehow (we are in Europe though).
I do think a DIY version is "doable", it will be a little harder though. It's more about the angles, I guess.
You need to go more to the side with the first bend and then make almost U-turn to end up perpendicular to the handle (from the front view). That way, you'll have the blade "under" the handle, not sticking out of it.
Also the ploskorez is round at the bottom side which helps it to get through the weeds, but you can just file it to shape at the end.
Make sure the U-turn part is also sharp - super handy, I sometimes cut stuff just with that part.
I don't think the material is too thick. I'd go narrower and shorter and file the bottom to be round, but wouldn't go thinner (hard to tell the thickness from the image though).
I would also omit the stiffener bit in the u-turn. Thats where the stuff needs to go through (and that's also why I wouldn't use thinner material - to keep strength).
If it is really necessary there (maybe your steel is not as hard as the original ploskorez), I'd turn it 90 degrees to create an extra hole in there.
I'm not sure if you were asking for smartytalk like this, so hope I'm not being rude.
I believe you'll get it much better next time and believe it is worth the effort
Love that you started to work on this!