You can get a 12mm AV switch which fits the original guarded switch hole. They aren't available at Ultrasabers, but TCSS should have them.
Even the 12mm AV switches are slightly larger than the hole for a guarded switch. This is why i order guarded switches when i order, so that i can tap out the hole to the wider threaded size and screw in the AV switch. It takes much patience but looks cool. Also the 12mm AV switches at TCSS only come in momentary so they need to be used with sound cards or a momentary to latching converter.
The one in the photos is a TCSS 12mm momentary switch threaded into a tapped out guarded switch hole in a Minarch CE stunt attached to a momentary to latching converter.