Compiling GWT with Java 8 compiler, but keeping GWT code to only use Java 6 constructs - possible?

I'd like to upgrade my project to Java 8.  We use GWT 2.0.3.

I have read the updates about full support of Java 8, and understand that to fully support it, the GWT code generator needs to support all Java8 features. 

However, what I need is a bit different I am happy to freeze the code UI code that interacts with GWT to only use Java6 constructs, so I don't need the code generator to support Java8 features.  

Is this possible?   I.e. to get my project compiled with Java 8, if the GWT code is only using Java 6 features.  

Would love to hear some opinions, as well possibly an update on the full Java 8 support timelines.   I saw that there is a fork that tried to move along this path.  

Thanks,

Jean

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