Bench soldering copper pipe into a subassembly
Yes, it's possible to bench solder, and in fact you should generally avoid soldering on an assembled threaded assembly. "Oven soldering" is a completely absurd approach to plumbing. Save it for your SMT electronics projects.

If you are very uncomfortable about soldering, just use threaded pipe (steel, brass, stainless steel...) and threaded fittings.