Hartley Falbaum

Hartley,
Since the root problem is glare from the compass, what about this
alternate solution:

Can you put window tint onto the front face of the compass?

The window tint film sold for car interiors may really cut the amount
of light hitting the compass markings and reflecting back out. You
could experiment with various levels of darkness.

This will probably be fine even if a little dark since you [usually]
don't fly after dark.

Chris