A first design for an adapter form the Quest 3 Strap to the Quest 2 Strap with space to allow the BOBOVR to attach.

NOTE — These have only been tested with the BOBOVR M1 (what I use). Because of the extra distance from the headset other straps may cause too much inward force, so if your facial interface doesn’t fit back on using your head strap with these I would not recommend using them.

onshape link:

https://cad.onshape.com/documents/0ddc08d00fc045d21f4acddd/w/a951392cdd100b15b9a7d4e1/e/7c401caf24890e077832afe6?renderMode=0&uiState=652606979b86d20cdc936f9c