Straight-cut gears are usually a little noisier, as you can perceive when you're using the reverse gear (which is usually straight-cut), but it also tends to last longer. If the noise wouldn't annoy you so much, it sounds like a reasonable mod.
But you should forget that cylinder deactivation trick, it's not a good idea for a Diesel at all.
BTW is your turbocharger a VGT or a fixed-geometry?
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