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farewell-
Would need drilling out to fit the 5/16" bolt, which would leave a very thin wall on the spigot. As usual, there's another way to skin the cat, by drilling and tapping the 5/16" bolt to create an M5 attachment point in the original boss, but that's not really any easier than just making the part I drew.
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You can easily make one of those with an M5 screw, 2 stem caps and some spacers (which many would have in their parts bin).
gbj_tester
Lolo
It's likely to be 5/16"×26TPI BSC. If you can fine an old front axle of that size with a lock nut on it, you'd just need a bit of suitable tube with a clearance hole for 5/16" but not so large that it misses the face of the boss completely. You can buy studding and nuts in that size if you don't want to carve up an old hub.
The other direction is to use the Constable's bolt and make a bucket with a hole in it to hide the bolt head, if your modern lights are aimed at 31.8mm bars there should be enough room to get a socket into the counterbore to tighten it.