Those regulators seem fine to me. And Smith is a reputable brand as far as I know.

I use screw-on nozzles, I'm sure they are fine (I don't see why not?). As for the tip sizes, I use sizes close to the AW 205, 207 and 209 for braze-ons, fillets and lugs, respectively, using bronze filler. I need an even bigger one (#36 drill aperture) for BBs and thick fork crowns. BUT I use propane fuel so I'll let the acet. guys opine. You probably can go with smaller tips. Btw I couldn't find any info on the brazing tips outlined in the kit you linked.

For bronze and flux there are a few options. Gasflux makes great paste flux (type-B) as well as bronze rod (low fuming, nickel silver and nickel bronze). Allstate and Harris have similar rods and paste flux.

Otherwise those tanks may be a bit small for brazing frames. But no experience with them.