Dude, I don't even need to tell you what a horrendously awful idea this is.
You think that those items (which are roughly $10000) can be replaced by some copper wire wrapped around a bic pen? it doesn't work that way.
My guess is that if you try this, you are most certainly going to die, and no, I am not being dramatic. Stents have more flex than you realize, and they are engineered as such. They are not simply wire wrapped around a mold. Your version will cut into your urethra, give you an infection because oh yes, no matter how much alcohol you dip it in, it's going to have bacteria on it, probably from the insertion, and it's going to get into your bloodstream, and you are going to die, or have a seriously long hospitalization, and I'm sure you don't want that.
If you aren't getting the results you want from the urologists you have seen, find another one, and keep looking until you find the one that will do the procedure. You will eventually find one that is sympathetic to your situation and will be willing to place the device for you. It's your only option in this case, because your version will most likely be deadly.
Please don't do it.
-piper