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I'd go for a BBK but not wilder cam.
Doing it this way will make your current cam softer.
You will not unleash all the power out of the BBK but it will get its torque and power earlier in the RPM range.
The hills have a bigger impact on FE when your CVT is downshifting.
I have no idea if the time of the hills vs more capacity all the time will net you economy gains but more capacity will make the vehicle faster and it's hard to resist going faster and losing fuel in the process.
But honestly I would leave it as is because you can never recoup the cost of improvement through economy gain.
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