I've been distracted with other things the last few months, but I took a look at this again today. FWIW, it turns out the problem is localized to the specific plugin I was trying to load, not the new vst3 structure. All the example vst3 plugins included with the Steinberg SDK are recognized by Reaper except for LegacyMIDICCOutEvent, which unfortunately is the plugin I was really interested in.
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