Looking at the Mintex catalogue the EVO 3 has the same brake pads as the FTO (GPX), would the calipers not be the same then. If so there should be several manufacturers of BIG brake conversions available. Possibly buy the calipers and get the brackets machined.
I think it is worth checking into. Anyone on here know anyone with an EVO 3 or 4 as the same front pads are on both.
Rory