To land a non Swiss registered helicopter off airfield, you will need to get authorisation from FOCA, the Swiss CAA. Prior to this, you will need to get permission from the land owner and send that to FOCA. They process can be done quite quickly, but maybe not in less than 24 hrs.
Even when you do land off airfield with permission, you get asked by almost everyone that passes you if you have said permission, and could even get a visit from a local official to check it.
Or re-reg to HB and land anywhere.
Hope that helps.