Perhaps one of these trs plugs that has a spring-loaded ground sleeve? https://www.neutrik.com/en/neutrik/products/plugs-jacks/plugs/professional-1-4-plugs/sile

Perhaps one of these trs plugs that has a spring-loaded ground sleeve? https://www.neutrik.com/en/neutrik/products/plugs-jacks/plugs/professional-1-4-plugs/silentplug https://www.neutrik.com/en/neutrik/products/plugs-jacks/plug...