ok thanks, good point. There is a slight angle to the dropouts (theyre vertical but they're not that vertical) so that might give me that bit of leeway I need....
I'd try skid stops as much as possible, but would run a brake anyway for when I had the freewheel on - planning to pop some forks on the front and use it off-road once or twice

While we're here, mind if I ask what your opinion on quick releases is? I'd prefer one so I could flip the wheel round quickly & just generally easier