Lapel Badges Mounting for Display.

[xrayrifle]

Hello.
Seeking help with badge mounting.
I am using shadow boxes to mount my military and first aid, ambulance badges for display.
The base on which the badges are to be mounted is felt over Styrofoam.
Badges that have loops present no difficulties in mounting, however those designed to fit into lapel button holes have me up against a brick wall.

I don't want to cut the moon shaped device down to a stump and so render the badge value down to a few pennies, but would be a workable option, but unwise.

The other option would be to carefuly hand cut an appropriately sized hole with a spade drill bit.........

I also need to come up with a way to mount military badges with a slider.

I would appreciate any help you may have to offer.

Kind regards
Bruce Gibbins.