It does work, been doing that for years, but pollen control is VERY difficult. If you do that to more than one plant, you’ll never really know if the pollen you intentionally added or some other pollen carried by the air from a different plant helped form any given seed. Also, autos develop so fast it can be hard to get a branch to grow male flowers fast enough to be of use, as too late in the flowering cycle the plant may be too close to death to properly develop seeds. Autos do just lose vigor and die eventually.
Finally, yeah, you can cross all of those, but if you are not really clear on your Mendellian genetics, you may be surprised to (e.g.) find not all of the seeds will necessarily be auto flowering.
Al that said, it’s interesting and enjoyable to do, you will learn a lot so go for it. It will teach you how difficult breeding actually is.
Oh, and consider all plant material exposed to the silver to be toxic and under no circumstances should you consume anything from the parts of the plant directly sprayed. the rest of the plant is perfectly safe from contamination though, so only spray a smell part of one branch.