I took off the fabric cover, peeled the foam back a little, drilled the screw holes out, and replaced the screws with machine thread bolts, nylock nuts, and washers.
Seems to be working after a couple hundred miles.
I had the same trouble
You should find the hanger bolt already threaded into the derailleur. It is not obviously a bolt until you remove it from the derailleur.
Thanks, Larry
What a great idea!
Thanks for doing this.
I did send you two pictures. Here's hoping you get a good response from the Cruzbike community.