Just leave the holes as they are.... when gluing on the scales, ensure you use enough epoxy/glue to fill the "hollows"/holes. The combination of the hollows, holes not only serve to lighten and aid in overall balance, but the addition of glue/epoxy create a sort of "epoxy rivet".
On hunter and larger sized full tangs, I also taper the tangs in addition to the holes and hollows.
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