I would probably do dowels with careful attention to grain, colour and orientation, the fretboard is not finished but often gets oiled. My 1957 Senator is indeed rosewood. Matching the colour and grain density would be hard. Your idea of taking out a piece of fretboard and putting in a block is a neat idea, if I understand your situation the holes are between the 14th and 15th frets, so pull those frets, rout, install the wood, match the colour, grain, etc, re-slot for frets and put the frets back in. My Hofner has an unbound fretboard making the replacement easier, but you also then have a seam on the fretboard edge to worry about.
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Brian Evans
Around 15 archtops, electrics, resonators, a lap steel, a uke, a mandolin, some I made, some I bought, some kinda showed up and wouldn't leave. Tatamagouche Nova Scotia.
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