If they could knock something out like the S2T extended dsg paddles for rather less than the £250ish that they cost (with import taxes) I'm sure there would be some takers. The difficulty is that the pin fixing area, where the extended paddle replaces the original, needs to be very accurate. The S2T items are each CNC machined from aircraft spec. aluminium (or titanium at even greater cost!), hence the cost. All of the cheaper competitors are cast aluminium, or plastic, and screw, or stick, to the original paddles. Obviously, the S2T replacement paddles are a much more elegant solution, and so command a premium price, but £250 is a lot of money.
Can you see something there for them?