How to create a device that accepts an external Ableton effect and displays it (unary rack)?

Hi there! I would like to create a device that accepts an arbitrary Ableton effect (just like a unary rack) and uses it internally to perform custom processing. The high level behavior would be the same as inserting an effect in an Audio Effect Rack (the effect is displayed and editable). The low level behavior, as opposed to an Audio Effect Rack, would be that it would be placed somewhere in the middle of my hidden Max processing chain. So the inserted effect is not processed directly but is rather used as a template for later. Is that possible? I know I can make it work with VSTs since their UI is external and we can instantiate VSTs from Max, but what about Ableton stock plugins? Thanks for your help.