Different GPOS and kern table possible?

Is there a way to keep the normal class-kerning in GPOS and a reduced kerning in the old style kern table?
When a use scripts like kern flattener it reduces both. Can I actually access the kern table and modify it?

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Only way to do this now is with two exports and merge the kern table into the OTF with GPOS, with fonttools after export.

We just added a KernFlatten plugin. But while doing it, I realized that the API I added a while ago was not sufficient. So the plugin will only work with the next update of the cutting edge version. When you install the plugin and have a “Export kern Table” parameter, it will automatically apply the same algorithm that the Kern Flattener script does. But on the fly on export.

Great, looking forward for the next cutting edge version. Many thanks.