Replace context menu of GTK applications

[Simon Schneegans <code simonschneegans de>]

Hey there!

I asked this question on another mailing list. There I got the hint to 
ask here, maybe you can help me!

I'm going to write my bachelor thesis on different menu types (e.g. Pie 
Menus). For this reason I'd like to replace the context menu of GTK 
applications (the menu opened by right-clicking). I don't want to 
recompile those applications, some kind of plugin technique would be 
awesome!

I thought of two possible approaches:

1. - I know it's possible to do this with the main application menu 
(like all the different global menus are doing it).
    - So here's my question: Is that possible for context menus as 
well? Is there an API for this purpose? If so, what's the way to go? 
Documentation on this topic is very sparse...

2. - Write a GTK module and try to do it with some GObject fancyness. 
May this work?

Best regards and thanks for your support,
Simon