Instead of acid , you could also just add in Thermite...easy to make , once you know how...and cuts right thru anything...Will not put the ratio here , but I am sure you could just look it up online these days lol
Its powdered metal and iron oxide(rust) , just need magnesium ribbon or other very high temp fuse...
I made some and tested it on an old safe a few months ago...cut right thru that thing...
Only problem is , that when the reaction takes place...it is pretty bright...so might not be good for "stealth"