If the Audi and BMW wants to continue, they could enter 8-8 or 10-10 cars like Audi and Mercedes did earlier.
In 2 years they can switch to full SuperGT compatible technical rules, so they can open the doors for the japanese factories.
They also can open the doors with some kind of BoP system between the german atmospheric and japanese turbo engines, but this could work only inshort term imho.
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