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it may be hard to find the right thread
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.
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gbj_tester
farewell
Oh no, I lied. It does have a threaded hole in. Oooh, that's exciting.
As you say, it may be hard to find the right thread mind.