While this setup certainly is do-able, I don’t see the point of this. Unless you need both dpad and directional stick at the same time (or are worried about a firmware update breaking ufb compatability), there isn’t really an advantage of having a stock xbox one pad mixed with a ufb. Just use the ufb by itself as it already supports the xbox one.
Another option is just to use both the brooks ufb and ps360+. I would recommend Wiring the ps360+ with the rj45 connector for legacy consoles and a usb connector to the ufb for modern consoles. You then wouldn’t need a switch to toggle them.