User options dialog for AEIO plugin

I'm working on an existing frame-based AEIO export plugin closely based on the FBIO AfterEffects SDK example.

I now want to extend the functionality to allow a user to select the desired output format, and implementing a user options dialog to be called by clicking "Format Options..." from the Output Module Settings dialog (i.e. using the AEIO_UserOptionsDialog callback):

The only UI elements needed would be a simple dropdown, checkboxes, radio buttons, etc - exactly like the TIFF and PNG exporter options, with the standard AfterEffects look-and-feel:

However, the SDK doesn't have any examples for this specific scenario, and searching this community forum suggests any such options dialog must be written with native OS window code (Javascript UI scripts cannot be used as they cannot be called from the Output Module Settings dialog box, because it's modal), or a suitable cross-platform windowing framework used (e.g. Qt, wxWidgets).

Is this truly the case? Is there no example code for the user options dialog code from the TIFF and PNG exporters, or similar?

Regards,

Derek.