Thanks for the reply. I know it's not drilled for a rear brake, but that's easy to fix I'm concerned if the bridge is in the right location for a brake.

Thanks for the heads up on the handling. I did check out that fork and quickly measured mine. My fork is 2cm axle to crown shorter and has .5cm less rake so hopefully I'll be okay.

I guess I could also try some fixed off-road. I just have to keep up with my 8yr old, so it should be doable.