Welding to prevent catalytic converter theft

It's becoming a daily issue of people getting surprise automotive surgery theft of their catalytic converters and to help avoid that fate I did some research and a security fix would be to get a steel cage welded around the converter. Most cat thieves are bringing battery powered saw-alls with blades meant for cutting aluminum so coming up against steel would either f**k their blade up or create such a racket that I would be woken up and bear mace them while they are under my car.

I don't know where to find such a shop in the Houston area that can perform such a job because they would likely need to weld steel to an aluminum frame which isn't an easy (or maybe even possible) job. I have a Toyota Prius c. Do you know any shops that could do this job?