I’ve replied in the following post, but perhaps it was buried in the thread:
We’d rather not expose the internals of classes like MenuBarModel for the reasons stated in that post. Doing this properly requires some thought and, with the release of JUCE 6 approaching, there’s no bandwidth on the team to look into it right now. If you can propose a PR which achieves what you want without exposing implementation details like this then we’d happily take a look and perhaps merge it but we won’t accept it as it is - I’ll close the PR on GitHub.