Good morning.
You may strike it lucky and someone knows someone who knows somewhere... but this site is really intended for English speaking people who are living in Switzerland or planning to do so. It is not a travel agency for folk wanting to spend their holidays here.
I would suggest you Google something like 'Wheelchair access Switzerland' and go through the sites there.
Or, if that doesn't help, you could try 'Disability holiday accomodation switzerland'
Having pushed more wheelchairs up more hills than I care to remember, I'm not sure that I wouldn't go to Holland on holiday if I were you!
However, the scenery here is fantastic and probably worth the effort it entails to be able to enjoy it.
Hope you find what you are looking for.