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The bypass mod is an advantage regardless of which pump you put in there. You don't need a high volume oil pump to take advantage of the bypass mod.
The mod basically just redirects spent oil from the pressure relief valve. The original way dumped it into the sump. The mod redirects it to the oil pump inlet, taking a little load off the scavenge pump. In the later "small" pumps they took the opportunity to increase the pressure side of the pump (and decrease the scavenge side a bit).
Keeping your early pump, you should get exactly the same oil pressure you would have gotten without the bypass mod. For a 2.0, I'd be happy with this. In fact, I did exactly this on a 2.7L race engine years ago, and always got 70-80 psi oil pressure.
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