can we socket legasy runes into another copy of their unique

Imagine what we could break or scale if they could. just from the video examples you can get:
Twisted Empyrean: ~14-~21% damage as mana
Trampletoe: 40% overkill damage as an aoe
Bramblejack: 500% of melee damage reflected
Elevore: 2 charm charges per second
Serle's Grit... actually this 1 isnt an add something, its a set maximum to 40%