I can confirm that, as of version 6.04, Reaper now supports VST3 plugins that output LegacyMidiCCOutEvents. After adding the hacks to juce_VST3Common.h suggested by @stephenk here, I was able to create a VST3 with Juce that lets incoming CC messages pass through and can also generate and output new CC messages. Since LegacyMidiCCOutEvent is slowly but surely gaining acceptance among hosts (including the Juce AudioPluginHost), it would be nice if Juce added official support for it.
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