Folding/Flip Key Conversion

Hi, I've searched but only found some expired links. I would like to change to a folding key and have seen cheap key conversions on ebay etc, but I also want a spare made up and don't know how much I trust a <£10 remote key to work reliably.

Does anyone know of a company who can supply new folding/flip keys to suit my TD5 and cut and program?

Thanks