Hi Joachim,
I’ve actually been doing the dark bag method you described myself with the prototype, it’s not an elegant solution but it works. We’re working on integrating a dark slide on the production version just like on other medium format cameras, that way the K-Pan body effectively becomes an interchangeable film back. This is also one of the reasons why the tripod mount on the K-Pan is built into the lens cones and not the body, it keeps the framing consistent even when changing the bodies/backs. I hope that answers your question, please don’t hesitate if you have any further queries.
Kind regards,
Paul