I have been looking into this lately. I will be working at the Factory after the New Year and hopefully i can take a couple of days to try and Sort something out.
I have a couple of contacts that are interested in supplying this type of set-up for us . One is a existing torch ( i am leaning towards this as it makes my job simpler)the other is having one developed from scratch ,this obviously makes my part in this more complex.
Hopefully when i get back we will have something in place for a Amp Control Torch. But i do have a busy schedule ahead of me and there is no guaranty it will be accomplished on this visit.
Cheers