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It's definitely an option. A few guys from Fista have build up Kaffenbacks as touring bikes and they as pretty satisfied. We'll see. I bought a steel GT frame off here like half a year ago that easily fits 32's. I'm thinking of chopping off the 1 inch headtube, replacing it with a 1 1/8 one and retrofitting some disc tabs onto it. It could end up being the cheapest & raddest option. No stress though as winter is far far away.
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@drøn had some success with a headtube swap I think, though I don't think it's easy. I'd love to have a go at it but I'm too precious over my frame. Would also be keen to see how this GT would come out, sounds sick.
Only fits two of your requirements, but would a kaffenback be a decent compromise?