All hard core pilots have FFB sticks, rudder pedals, throttles etc. But the numbers of those customers are limited. But there will be a growing number of VR equipped folks, without any flight experience and equipment. They are looking for "new" VR experiences. A flight over Stalingrad in a He111 could thrill them.
My suggestion: An emolution of a mouse (right hand) and the throttle (left hand) for the VR standard input devices. BoX can already be flown with mouse control. This could be a chance to really "use" it.
Together with a preset "easy control", and they could have the WW2 flying experience without any extra investment.