Here's another workaround for the Missing Plug-in message in Evernote Legacy and macOS Ventura v13.3/13.3.1
Right Click the Missing Plug-in message so it turns blue, indicating it's selected
Select File > Quick Look Attachments (or press Command>Y)
The selected PDF will open in Quick Look. You can select Open with Preview from the Quick Look window, if you prefer.
This works for me using Evernote Legacy v7.14.1 and Ventura v13.3.1, running under OpenCore Legacy Patcher v0.6.4