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Update: Went out and tried various screws.

I was wrong, a 1/4 UNC screw don't fit in the magneto. In my defence, a 1/4 UNC nut fits on the dynamo strap 1/4W screw.

There must be a lot of nonworking magdynos littering your country. So a good chance to find secondhand screws. Otherwise, if you can't find a substitute in your local hardware store, a brit bike parts supplier might have it.

E.g https://www.rgmnorton.co.uk/buy/dynamo-strap_1922.htm

or https://bmhstore.bmh.com.au/index.php?main_page=product_info&cPath=38_11&products_id=30

or https://bmhstore.bmh.com.au/index.php?main_page=product_info&cPath=38_11&products_id=565

You can probably find more Googling