I think if you are cooking at home you just need to be brave with how how you let the oil get before adding in the spices. Az usually leaves the veg ghee to heat up for at least 30 seconds on maximum heat before starting cooking. At home, you might need to wait 2 or more minutes depending on your hob. The magic seems to happen in the first minute of frying, singing and quenching so the fact he has industrial burners won't make much of a difference apart from how long it takes for the pan to get up to frying temperature.
For the record, after cooking Roshney's in Zaal and Chutneys a few times I can now honestly claim to be able to reproduce a 100% clone at home (including 2 ft flames for the tarka). I think you'd struggle a little with an electric hob as you wouldn't be able to get the flames started without a gas torch. I think when Az cooked the non-vindaloo strength one there was no flambee and it still tasted good - just not as exciting

I think someone video'd my Roshney didn't they? Would be good to watch back when you get round to uploading them all.