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@lae
Not having to flip the wheel to change ratios is much more convenient. Unless you absolutely need the fixed-gear ratios, I would stick with a freehub design rather than the ENO double freewheel - freehub is stronger, cheaper and you can vary the ratios to suit whatever you want.
I'm convinced there is a way of cleverly engineering a fixed sprocket and freewheel onto the same side of the same hub. Just a hub built with a custom extra-long threading, so that you can thread a freewheel on, then a fixed sprocket, then a lockring. That'd be wonderful. Shouldn't be too expensive either - a few hundreds of pounds, perhaps - machine the hub (forged would be preferable but too expensive for a single piece) and then get custom threads cut on it. Or - a forged hub with an extra-long threading welded to it, so long as you know a professional engineer/welder who is happy that it'll be strong enough.