there is as action "Paste as takes in items" search for it in the action list.
however, there doesn't seem to be a "copy active take" action - so we might have to script something here - or just go "old school" and make a custom action, if you are comfortable making custom actions, this should be easy for you.
untested, and I'm guessing a bit at the action names, but I'm 90% sure this should work.
Custom action: copy active take. (be sure to consolidate undo points)
(Make sure the take you want to paste is active)
Take: crop to active take:
edit: copy items/tracks/envelope points (depending on focus)
edit: undo *(i think you just need one here here as I don't think the copy action makes an undo point, if not run this twice)
after that you then use the "paste as takes action" into the other item.
if this doesn't work let me know, or I'm sure someone will be by with a better solution.