How to use single-sided kerning class

[ruebezahl]

I have a font with very pronounced shapes, and as a consequence, kerning classes are set up on a per-letter basis (so O and all accented versions make up a class). Of course any kerning that involves O as the second glyph would also apply to an OE ligature as a second glyph, but I cannot just create an OE single-sided class and put the O and the OE in it (this will eventually lead to the "some pairs may never be accessed" warning)
Is there a way to let fontlab achieve this effect, rather than having to copy the relevant rules

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