Yes. All you need is a business registration and a bank account with €5k in it. Both easy to setup in a week or two. https://en.m.wikipedia.org/wiki/DAFT
No, this isn't correct. If you set up a ZZP you lose it forever, however if you create a BV and hire yourself into it, you can have it. Source: I did this.
Hmm, your right. Sorry about the mis information. I was confusing it with the knowledge worker status but that would only work if a company hires you and sponsors your application. So nothing to do with DAFT. Even as 'zzp' you still get a lot of tax benefits though. Especially the first few years. But if that does indeed invalidate your claim for the 30% ruling your method seems like the way to go.