I see.
I twould suggest you add a new thread and share a little more what you tried so far for VR without controllers.
Right now it looks like a random person asking fro something unusual without any purpose. Unfortunately, bias didn't even let it cross my mind why that would be useful in any scenario.
So, you could write a little more on the things you tried so far, what equipment you have (VR), how do you connect to VaM in VR.
By no means you have to say why you need the mouse, it's just so that potential repliers can see that it's someone wanting to achieve this goal and not some random asking for weird things and never coming back to the forum to see the replies.