I'm sure you could get an extra set of 3A92 cams and have them ground down for an 'economy grind'. Its just a matter of if you're willing to pay for it.
A performance grind is harder since you need more material on the cam lobe. There are places known to weld additional material onto the lobe, and then grind a new profile on it. This of course would cost more since its an additional operation.
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View my fuel log 2015 Mirage DE 1.2 manual: 47.2 mpg (US) ... 20.1 km/L ... 5.0 L/100 km ... 56.7 mpg (Imp)