Kanko should start training abroad anyways - go to the US or Canada and then maybe if she wanted to switch to pairs she could find a partner and if not she could improve on her singles skating.
But the chinese men are short too, yet they have great pairs teams. There's not a huge height difference between Shen and Zhao. If Kanako stays tiny, even a 5'6'' or 5'7" guy will be big enough for her. I think the major obstacle is the lack of interest in pairs in Japan.
Northern Chinese men (where the ice skaters come from) are generally taller and stronger than Japanese men. I've seen Shen and Zhao and Pang and Tong in real life with and without skates, and Zhao is a relatively small guy (5'-9-ish but quite strong) but also not Oda-sized, and Tong is pushing 5'-11, also quite strong. The Chinese pairs ladies are also kept artificially (dangerously) thin, but that's another issue for another thread.
Japan isn't all a nation of hobbit-sized men, it's a large enough country to have some variety. But skaters have to be noticed and developed from a reasonably early age. And what Japan is most lacking is a Bin Yao.