Alright, Casetti-sault can do MDE Solo quite well.
Provided, of course, you aren't retarded in how you pack picks and EGO gifts.
AKA, me, I was the retard.
I had to do this twice because the first time around I fucked up and missed a very specific gift so I had to cancel it at floor 15 since I got greedy and tried to do the Lei Heng random encounter after I somehow managed Charon on Floor 14.
Manor-Shaped Music Box is unironically god tier btw, free stagger recovery for anyone is really fucking good.

I tested Carmilla v Crushbound and flatly, for a solo, Crushbound is several magnitudes superior cause of its giga AOE and damage/stagger. In an actual team Carmilla is probably better for Bloodfiends, but as it stands Crushbound's better for this.