After not being able to find any suitable ones for the scale (and in the budget) I made my own markers using a Litko's thin plywood disc, flexible metal and flexible magnet sandwich.
It's simple, flexible and discrete and blends nicely on the table.
For more pics and description see http://10mmnapoleonics.blogspot.com/201 ... rkers.html
I have also made links to the file for dials if anyone wants to modify or make their own.