Best Way to Repair A Chipped Grip???

[sheepherder]

It's not a Luger grip, but the method should be the same...

My Gasser grip has a chip out of it; it chipped with the grain, pretty much in one plane...

I'm wondering how to graft a piece of wood in to repair it...

Sand/rout it flat and glue a piece on with as little glueline as possible showing??? Shape the new piece to fit the existing contour and let the glueline be what it wants to be??? Dovetail a new piece in???

What kind of adhesive??? Glue??? Epoxy??? Polyester resin???

Shaping it afterward should be pretty straightforward...and it will always look 'fixed'...so what would a period armorer/smith have done to repair it???

I've seen gunstocks with some elaborate wood repairs [Enfields]...

How would an Austrian or German have repaired a chipped grip???