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@TM the Swytch lot have had a special 74mm narrow hub and wheel made just for their Brompton kit, no filing or stretching needed, drops straight into the fork.
Weight wise its a little less for this kit over the Brompton, and because it comes as a built wheel it means it's possible to switch out and have the Brompton back as 100% stock.
The official one meant you are always lumped with the weight penalty of the hub motor (and cables/internals) even if you took the battery unit off.Apparently their test units are out with press this week, so should start seeing some impressions.
The conversions rely on splaying the forks. It works but it’s a bodge, and voids your warranty.
The Brompton version is actually relatively good value imo, and it’s perfectly integrated.