Welcome to the forum! Since you're looking at keg fittings, I'll assume you're not all that new to brewing.
has some weldless fittings that might work for you. They're really nothing more than bulkhead fittings, but they do work. Welding is an option if there's a small shop in your area. Offer them a few bucks and some homebrew, you may be amazed at what they can make for you!