When a plugin (MIDI plugin, in my case) is compiled as a standalone plugin app, do you have an option to get rid of the “Options” button/menu at the upper left and handle MIDI ins/outs and saving/loading data yourself? Or alternately, override it (although I’d much rather get rid of it…) The plugin processes no audio, just MIDI.
When I’ve needed to do this in the past I’ve just made my own standalone wrapper based on the JUCE Standalone app code.