This is really much better than it might initially seem.
You are
very lucky to have a welder for a DH because safety is paramount and nearly everything we have learned about safety in lampwork has come directly from the welding world.
And also, you quite possibly have the absolute best equipment (tanks, regulators, safety devices, etc) for lampwork (except just the torch) that few in lampwork are fortunate enough to have - and what they wish they could have had when they first started, or even today!
Here's what he needs to know: Tell him you need a flame temperature of between 3500 degrees (minimum) and 4500 degrees (maximum). Glass begins to "melt" at 1200 degrees, and "drips" all over the place at 2200 degrees. (He knows how hot acetylene burns - 5800+ degrees - it heats (melts) glass way too fast to control the flow - say that to him... "heats too fast to control the flow".).
Good news is... you have almost everything you need... the only thing you need to swap out is the torch and fuel hose, which were probably the lesser expensive items. A two-gas, surface mix, lampwork torch will be $160-$190, and sometimes less in the LE Garage Sale area. The T-grade propane hose is about $15. And use a BBQ for propane fuel.
Ditto the ventilation... he will know about that too and how very important it is. Tell him melting glass is similar to welding stainless steel, fume-wise (not temperature-wise).
Finally. Eye Protection. You could use welders glasses (and would have to if acetylene was used) to protect your eyes (I'd balk at the helmet though
), but far better are glasses called Didymiums. All torch flames when working soft glass create a yellow flare that blocks your ability to clearly see what is happeing to the glass inside the flame. Didymiums erase the yellow flare and let you clearly see what is happening to the glass. And will also protect your eyes from glass when it sometimes "pops" - which it will. Even to the best of us.
I'll stay away from recommending a specfic torch, but three that immediately come to mind, in alphabetical order, are: Carlisle Mini-CC, GTT Bobcat, and Nortel Minor Burner.
Bill
p.s. Acetylene is a VERY expensive fuel. You will save enough in just a few tanks of fuel (using propane), that you will very quickly payback the cost of the lampwork torch.