I would not be surprised if these have been manufactured, but I don't recall ever seeing one.
On easy way to make one would be to find an old 120 folder -- preferable one that's beat up, AKA free. These 90° finders were commonly used on them. They came in various sizes, but all you need to do is glue a flash shoe to the bottom.
Well 'light' certainly doesn't describe a Nikon F or any other professional system camera with interchangeable finders.I'm looking for something fully manual and as light as possible.
A level in a hot shoe might do the trick - https://www.bhphotovideo.com/c/product/780405-REG/Vello_BL_HS2_Two_Axis_Hot_Shoe_Bubble_Level.html/?ap=y&ap=y&smp=y&smp=y&lsft=BI:6879 - I could just check to see where the bubble is when properly mounted and keep an eye on it
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