What would happen if you bought the property and later were denied the kennel permit? Would you still be happy living there?
If so, my gut feeling is to buy now. There are so few suitable properties in all of Switzerland that the opportunity might not come up again for a very long time. I rather regret the 'one that got away' when I listened to my head not my heart...
(Can you even apply for permission without being the owner? I'm extrapolating from a property issue we looked into in SZ, so different canton yadda yadda - but that was an issue. )
How is the property zoned? Landwirtschaft, Ausserbauzone, etc? I ask because a kennel in SZ lost it's permit recently when the canton decide to get stricter about non-agricultural activity in the Landwirtschaftszone. Livestock yes, dogs no. (Again different canton yadda yadda.) So do make sure that at least theoretically a kennel could be permitted in the zone.
While you are winning hearts and minds
and applying for permission, could you start in-home boarding in a very small way? Under the 5 guest dog limit. I would do this for two reasons: first, to establish your name and repuation in the area, and second the neighbors likely won't even notice... an already 'unnoticed' small establishment would go a long way to gaining their acceptance for your larger plans.
Wishing you every success with your plans. There is such a need for reliable, dependable, experienced care.