Vive Pro without base stations

Hi,

Does anyone know a solution to make the a Vive Pro HMD work outside of its tracking area? The project I am working on will have users looking through the front cameras of the headset (with some image processing applied) and will not need any kind of head tracking. We'd also like them to be able to walk around freely and not be confined to one room.
We also need eye tracking so we are using a Vive Pro Eye. This is the best eye tracking headset available (with a reasonable price point), so we'd really like to keep using it.

Thanks for any help!