cutting holes in collision meshes

i am building a scene for a prototype in unity. as a joke, i decide to add a set of keys that you can shake around in VR. Thing is, im not sure how to cut a hole in the key models such that the ring collides with it. currently the keys just pass through. is what im suggesting even possible? thank you very much.

You could do that by deconstructing the colliders into smaller simpler parts.

The ring could be constructed of about 8 to 12 capsule colliders. Each key could be constructed with 3 or 4 box colliders.

that is really really smart, ill try that