GPOS system of double-stacked diacritics?

Is it possible to contextually change the values of the top and _top anchors in Latin glyphs & diacritics? I would like to see if I can improve on some double-stacked diacritical characters. I’m guessing tokens would be involved in this, were it to happen?

Context anchors: Edit View: Anchors — Glyphs Handbook

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I’m having a look at this now. There are a few issues:

  1. I created the @CombiningTopAccents class, but updating the features also puts a class by the same name into the ccmp feature. Should I just delete the class outside the ccmp feature?
  2. Is there is way to write the context so that the anchors are used both when the glyph comes before @CombiningTopAccents and when they come after @CombiningTopAccents?
  3. What do I do with the pre-composed glyphs? I can’t use the new anchors to place those diacritics, so do I delete them?

Ping @GeorgSeifert