Post #2849: 
z01ks:
I tried a few things but couldn’t get it to work.
You can use Regular Menu to select a collection for the tool.
This code generates a list of available collections (Custom tab):
[(globals().update(row=L.row()), row.context_pointer_set("collection", collection), operator(row, "object.instance_offset_from_cursor", text=collection.name)) for collection in C.object.users_collection]
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