I didn't know this advanced alchemical furnace was a thing, interesting. Is it locked behind forbidden knowledge somewhere?
Yep, it requires items you get from the special thaumcraft dimension which is itself locked behind the eldritch research tree which needs a bunch of warp to gain access to.
As far as fuel consumption goes it's really not that bad, although I suppose if you're not using charcoal it could very easily be a bit annoying. I've just got one coke oven feeding into a high pressure boiler and it voids most of the steam it makes but it's still enough for my usage even into the start of LV. Need a better solution but haven't got one going yet, I've got the parts for a railcraft boiler but need the charcoal to supply it. That and I've looked at buildcraft for automating things, need millions of RF to actually do it though due to the high energy costs of the assembly table.