Oke, for those who are interested in the final solution(my final solution) ;-)
The first attemt was to use master2slave from Jeff. The problem obviously was windows ;-) The combination of windows, bind, a linux-like shell, scripts etc. was not that perfect to start with.
I took some time to look for other solutions and finaly made a test machine with powerdns on it(linux, no DA installed). I used mysql as the backend.
The powerDNS server runs as a slave only, not a master. I added a record in the supermastertable for each DA serverIP with the name of the first nameserver.
On every DA server I added this to the named.conf:
also-notify { <ip of the powerdns server); };
I simple restarted named on every DA server and voilla, all domains where tranfered perfectly.
Then I started testing with a few domains. No problems, so I changed the IP of my secondary nameserver. Tested it for a week with all the domains and no problems at all.
Then I reinstalled the old DA multi-server who acted as secondary before and installed powerdns on it. No master and no slave enabled on that one. I used mysql sync to get the data from the first powerdns server.
On the plesk servers, two at this moment, I only added the also-notify to the bind.conf. Of course I changed the DNS template for the domains there.
This is all working in production now without any problems.
Few things to consider.
Deleting a domain does NOT delete the zone in powerdns automaticly. Since I use one administration system and I only delete domains through the administration system I simply delete the zone in the mysql database one and the replication does the rest.
For moving a domain to another server you have to make a script for that or delete the zone manualy before the restore.
I use poweradmin on the master for manualy checks.
So I still have only 2 nameservers for ALL of my domains no matter if they are on a DA server or on a Plesk (windos or linux) server.
I don't use/need the DA multi-server option anymore.