Will this work? Can I use the Austrian company’s dashboard to point to cloudflare nameservers and have cloudflare in turn point to different nameservers? (Note: disregard the weird spacing, new users can only put 2 links in a topic)
This would only work If you want to delegate sub zones away. The records for this zones would be handled by b. d. e. and f. and will not use any Cloudflare features.
It’s not entirely clear what you want to do. Setting your nameservers at your registrar to the Cloudflare nameservers means the whole world will ask Cloudflare for the DNS records.
What do you expect to happen by setting the NS records in Cloudflare to be those of another provider?