First new so sorry if I have missed I did try searching but couldn't find anything.

Is it possible to 'delevel' a champion.  (remove experience and levels (and corresponding traits).

My ideal that I would really like is a spell/item  'Rebirth':

That resets the Champion to level 1 with no class set (can't remember proper name here it work but Mage, Assassin, Commander, etc).

In its barest form this would e acceptable but a high price to build the champion the way 'you want',  my ideal would be when resetting it notes the current experience.  Resets the character,  then grants say half the experience back.

Does something like this exist? 

Would it be possible to do?

A simpler form though also very penalizing,  Would it be possible to just luck all champions at level 1,  so while you have to totally level them up...  you can build them the way you like.