How can I remove an OVS extension from a context attribute?

In our Web Dynpro application we provide a generic search mask to the user. The information about the search fields like labels, length etc. is retrieved from the backend during runtime. Also, the information if there should be a value help available or not is read from the backend during runtime. In case there should be a value help for a search field we just add an OVS extension, using method WDValueServices.addOVSExtension(...). For this, we pass the AttributeInfo of all relevant context attributes to this method.
The problem is now the following: The user can switch between different kinds of search masks. Because of the generic implementation all use the same Web Dynpro context. So it might be that the search field #1 on the first input mask has a value help whereas search field #2 on the second input mask doesn't. But if we once have added an OVS extension to the context attribute of search field #1 it can apparently never be removed anymore. At least I couldn't find a method to remove it.

At least your second proposal would work for sure if I had only static context nodes apart from the dynmic OVS context. But in my case I can not use wdContext.reset(false) since I have dynamic context nodes in my controller that would get lost. And unfortunately, there is no method available to reset a specific context node only instead of the whole context.
I contacted the responsible Web Dynpro developers in the mean time and they offered to implement an API in SP11 to remove the OVS.

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