Right off the top of my head, I can think of five examples.How often do under-age athletes switch countries? Kolesnik is the only other example that jumps immediately to mind. And I guess Kurakova maybe? Not sure how old she is/was when she made the switch to Poland.
Julia Lautowa was twelve when she moved to Austria. I recall reading that she moved because her coach moved. Did her family move too?
Alexei Krasnozhon started skating for the U.S. at thirteen.
Anastasiia Smirnova cannot have been older than fifteen when she switched from Ukraine to the U.S.
Denys Strekalin and Terra Findlay were each seventeen when they teamed up with their respective new partners to skate for France.
I am sure that I could come up with more examples if I dug around. In how many instances did these changes happen at the instigation of the Federations rather than the skaters themselves? Or is is even possible to draw a meaningful distinction?