This statement made me want to do some research and, for Worlds 2019, there were:
11/27 ice dance couples (40.7% of the field) with at least one half of the couple representing another country than the one they were born/primarily lived in (the country previously represented by the skater is in brackets):
- Weaver (USA) / Poje
- Gilles (USA) / Poirier
- Guignard (France) / Fabbri
- Fournier Beaudry / Sørensen (Denmark)
- Hurtado / Khaliavin (Russia)
- Lauriault (Canada )/ Le Gac
- Reed (Georgia/Israel) / Ambrulevičius
- Yanovskaya (Russia) / Lukács
- Komatsubara / Koleto (USA/Norway)
- Manni (Italy) / Röthlisberger
- Ichilov / Davidovich (Belarus)
5/19 pairs teams (26% of the field) with at least one half of the couple representing another country than the one they were born/primarily lived in (the country previously represented by the skater is in brackets):
- Zabiiako (Estonia) / Enbert
- James (Great Britain) / Cipres
- Hocke / Blommaert (Belgium)
- Petranović / Souza-Cordeiro (Russia)
- Jones / Boyadji (France)
Apologies for this being a bit off-topic...