I have a folding bike (Xootr Swift) and want to put a weather-agnostic brake on the front.

my original plan was to try a disc brake, which I understand requires a tab on the front fork. no one seems to sell a fork for this bike with a tab, but I suppose I could have one welded on (it is a steel fork). Should that make me nervous, or is that a reasonable approach? (of course I would need to get a wheel built)

someone suggested going the drum route instead, mounting it using a jubilee clip on the fork which would not require welding. sounds easy but also sounds less secure. also, how is the performance say of a Sturmey-Archer 90mm X-RD? I have shimano IM-50 drum brakes on my Trek Soho, but they suck rocks so I am skeptical.

of course I could just leave the V-brakes on there, but they don't work so well in the rain and snow