That basket will become a wiffle ball over 20.
Your bike is a good candidate for using a rear rack basket- actually the same basket as a removable front basket- atached to the bars with a couple of worm clamps- I think you can still get one on ebay for about $17 shipped, or with the removable bracket for under $25. Won't hold quite as much, but won't catch so much wind either- and not so much welding
I found out with a close weave Bell basket, now only use wire ones