You can get a brass ball valve at some Lowes/HD. You are going to have a !#$^&@ of a time finding the rest of the parts in stainless. Anything that touches the wort needs to be stainless, They do not make all these parts in brass, to my knowledge and galvanized steel will corrode and rust very fast.
It looks like BF has the keg weldless bulkhead kits....
“I'm not drunk, I'm from Wisconsin.”
We have been out drinking your state since 1848!