I think it is a good goal. I don’t know how much they care about fluctuating gas. They have to stay -really- hot to be efficient and they have to stay up to temp. It also changes the dynamics to where you need to filter the stream of gas to pure syngas. sulfer screws it up, and I would imagine nitrogen does as well.
i haven’t seen much on “here make your own!” either. The PEM ones, you can buy membranes and stuff off the shelf.