Taking a quick look at the blueprints, the "Oversized" trait itself is purely cosmetic, and the effects (e.g. increased damage dice) are just set directly on the base item (not as a consequence of the trait). So, increasing reach would have to be done individually on all oversized weapons. Also, as far as I can tell, there's not a strong basis in the rules-as-written for Oversized weapons to automatically have a larger reach.
This is all to say that yes, this change is possible, but it'd be a bit of work, and I'm not personally interested in making the mod. No harm in asking, though!
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This is all to say that yes, this change is possible, but it'd be a bit of work, and I'm not personally interested in making the mod. No harm in asking, though!