/diy/ - Do It Yourself

Replacing an ABS sensor on a car (shitbox).
Normally the body of the sensor fits in a hole in the upright, then a bolt goes into a blind hole and cinches it down + ensures correct orientation.
When taking it apart the bolt head stripped and I failed to get it out with an extractor (red X).

I didn't want to just epoxy/glue the sensor to the upright in case I need to take it off again, so I was wondering if I could attach a stud to the upright somehow (green).
Could buy a welder and/or torch+brazing rod, but then it hit me that regular 60/40 solder might be enough for this job and save me some money. Could this work?
Main issue would be road vibration which I feel like solder might not be effective with.

TL;DR How strong is 60/40 solder between two regular steels?