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freewheel instead of fixed thread should give you more room to align the adapter properly for the rear brake
Why even flip it around? If you have a disc brake on the rear wheel, it's not really a problem to have the drive sprocket in suicide mode. I think on balance I'd take a suicide hub with a proper 6-bolt attachment for the brake rotor over a 6-bolt proper fixed drive but a brake hanging by a thread
Ha, proper niche! I had actually searched for double disc hub knowing that it likely didn't exist - but funny to know it wasn't a totally unique line of enquiry.
I imagine I would end up with the surly hub, but figured it was worth looking around for as the hubs are £120!