If you are in VR you could have a large 21 inch bass attached to it.
I have thought of a small motor for vibration. Sure, that can be done and there is room. Just have to find the exact part and datasheet. Having the handlebar buss, if there is a warning is maybe over the top for bike application.
I believe a knop for moving inside VR is just as important, But that will require some extra thinking to the circuit (maybe have it as a i2c breakout board for wired integration into the final sword assembly. Which would require drilling holes for signal and power lines or have the holes integrated into the hood). I guess it will be on the other hand with the VR controller for the specific platform. You could also have a custom VR glove with some kind of sensor for measuring finger bending and some buttons inside the palm. If you wanted to integrate a small vibrater (like the ones in phones) it would probably be located in the space between the battery and the LED PCB.