If you dont want to use ink permanent or otherwise, you could use a wax pencils. A set of different colors is not expensive. Easy to clean and they will not rub off very fast.
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I do have a set, but not sure they go small enough - we’ll see when I do a trial run.
I think I’m sold on luminous markers now, but cool idea.
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The markers arrived today, and I did a quick test install in a scrap of oak (don’t have any maple lying around). The install is straightforward, but I’m having second thoughts about the luminous thing. The dots are small and there really isn’t much material to maintain luminosity for more than a few minutes. Coupled with that the dots are single sided - one side luminous and the other is white - the white side is significantly brighter than the luminous side once the ‘charge’ has worn off, and also brighter than the original wooden dots fitted.
So I’m currently considering installing the markers ‘backwards’ - no ‘glow in the dark’, but hopefully better than the current set up.
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Hey @mathsjunky Check these guys out.
Edit: You do have to charge these. Uhg. Sorry. I got excited
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Tippex! 
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