Holinger sells two transverse sequential gearboxes. They come with a bellhousing made to fit the engine and they already have the measurements for the Ford bolt patterns and maybe also for a Zetec/CVH front starter bellhousing.

For the price of one Holinger box you'd probably get nearly three Quaife boxes but the Holinger ones come as 6-speed instead of the 5-speed Quaife boxes and the Holinger ones probably last ten times longer than a Quaife one.

https://www.holinger.de/showroom/category/transverse