Torquetalk you are right. The problem is that there are only short term contracts for Offshore - HEMS at the german coast at the moment.
Therefore at the time being there is no big interest from the traditional Offshore-Operators to provide this service in germany.
Without longterm contracts it seems not possible to provide state of the art helicopter equipment to this kind of operation.
In addition HEMS operations in the offshore context means a lot of training and currency flights but low hours of paid flight time.
On Wind-Offshore manager told me that his company estimates 3-4 accidents per year where a helo is needed. With this number in mind it is easy to understand, that managers tend to accept the risk of "cheap"-services.
It would be different, when personal is transfered regulary to offshore sites. In this case the employes actually see the standards every day.
In HEMS operation the provided service is invisible most of the time.
It might change in the future, but due to the political situation in germany investments in offshore wind operation are at least delayed and presently there is no "big cake".