I should be able to pull that off but not with an awakened yuyu. I can max her to 50cc60 which I am currently working on, guess all I need is a 2 stars then I can get up to the black spirits which I need for my sybilla.
Though once I max yuyu I will give it a shot for sure!
I got a couple of other yuyu's recently which I can use as fodder for her to CR and get her skill up so should be able to get to skill level 2 at least, only issue I have is I just threw all expect one of the callliope I had into CR and skill lvling up my 50CC50 Calliope which I have no regrets doing as she is currently min cost at 10. I will need that last one to CC my current yuyu.
I could use one of my spirits I have gotten for skill level up but would rather use them for rarer units, such as my sybilla.
Here hoping the next event has some silver witch drops