Hmmm kay...
The fins are very carefully proportionned, so that the fin width and the channel width fall within a set ratio. Also, your proposal includes cutting into the fins, to make them thinner.
By affecting this ratio, and by reducing the thickness of the fins, you are loosing some performance.
BUT
you might be able to gain some of it back, from the turbulence that this design is going to put into the water flow.
BTW, you can cut those channels like Morphling1 did: use a circular saw blade. It should be possible to reach even 0.2 mm, but that gets tricky.
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