Merge into context menu

[Villeroy]

Can an extension package’s AddonUI.xcu merge a menu entry into Calc’s content menu for cells? Can’t find anything in the dev guide nor sample add-ons.
EDIT: Does anybody know how to address an existing item in the cell’s context menu like an item in the menu bar such as .uno:DataMenu\.uno:DataSort?

[Wanderer]

I found mostly questions without answers. This is zhe most promising so far

Add items to context menu programatically

I have a whole lot of macros in a shared Basic library which is accessed from multiple machines and OSes so when I make changes to the code it available to all the others. In the library is a sub, which gets executed at application start, to create a custom menu. I now want to add custom entries to the Writer’s Context Menu for text. I can do it manually from Tools > Customize but I would like to have it created programmatically so I can have it appear across all my machines/OSes on app startup. …

[Villeroy]

This looks creepy to me, though very interesting from a technical point of view. It is slow, poorly debugged and too complex (to me, at least). I’m going to publish an extension, and I don’t want to roll out this interceptor to other people’s computers.
I stored it in my toxic library for later reference. Version 1.0 of my extension will be released without context menu entry.