Aluminium Pedals from the Cupra should be just a part to order, so they can be fitted to almost any of the new Leons' Though auto's (DSG) probably being the only exception.
Bluetooth Pack and TomTom both require a mute feed to the radio. So it kills sound from the radio when you get a call, or when you get an instruction from TomTom. TomTom's have bluetooth built in for calls also, so it maybe possible to compromise by using the TomTom system instead, and not getting the SEAT bluetooth. But then you lose the larger MFD.
Unfortunately its one or the other. If a mount is available for the Leon as yet, not sure if it is or not. But won't stop the mount being fitted, it could still be wired to power the TomTom, just not muted for the bluetooth. But if you have bluetooth for the car anyway, it doesn't matter.
But as it's probably not in any kind of offical SEAT works instruction, then the dealers probably won't be able do it.