I can't give you any specific advice about special education.
But I do know that to teach in the state sector here you will need C2 level German.
And I also know (from personal experience) that trying to get a foreign teaching qualification recognised can be a nightmare, particularly if you have an unusual degree (the body that grants teaching equivalencies seems to have a list that goes 'qualification x from this country equals qualification y in Switzerland'... and if your qualification is not on the list... good luck!).
So I would say if you're really serious about working in special education here, work on your German and on getting your written German up to scratch, and then do your studies here. It may take a little longer, but I think it will be much less hassle in the long run.
Have you had a look here
? I don't speak German so I can't point you to the specific page, but it's a very good website for finding out about how to get into different careers, and also has information about 'unconventional' paths into certain careers, for example if you have professional experience which can be validated in place of studies...
Hope that helps.