Russia hasn't replaced Kazakova/Reviya yet and they were the first withdrawal last week (before the Men & Pairs withdrawals).
Looking at the hypothetical alternates lists:
Mueller/Dieck - train in Moscow and don't have a 2nd assignment yet
Nazarova/Nikitin - also haven't received a 2nd assignment & are closest being in Kharkiv
Versluis/Turkkila - clearly the rules are kind of elastic this season; train in Helsinki
Taschlerova/Taschler - haven't received a GP invitation yet but should be pretty high on the alternates list
Harris/Chan - should be on the alternates list & are at IAM who are already there with F-B/S and H/B
Moscheni/Fioretti - again, if the alternates list rules are elastic, they are in the same camp as Guignard/Fabbri so they might be an option