I really need the item set creator implemented at the current old client level before the old client is dropped. If it isn't, it's very likely I'll drop League of Legends because of it, because it will adversely impact my gameplay that much. In fact, so important is that one feature to me that I would rather see the entire new client completely scrapped, replays and sandbox with it, than give up the item set creator.
As such, I will not be trying the beta unless and until I hear the item set creator's being implemented, and I will not be spending any money on League until I know whether or not I'll still be playing it in a few months or not.
So far, I have not seen any actual 3rd party replacement for the item set creator, and I am skeptical at best of a 3rd party option serving as an adequate replacement long-term anyways. Championify isn't even remotely close; it serves a completely different function, one I have no use for. I make my own itemization choices based on my actual style and abilities.
I'd also prefer Draft kept, but as I understand it, it is being kept in NA, just dropped from some of the smaller regions.