This type of transfer is not unheard of, however it is fairly uncommon for a teams to reach an agreement. If it is to happen it could happen under two different scenarios:
Alpecin-Deceuninck agree to let Vine go in exchange for a fee (such as Egan Bernal's INEOS transfer in 2018), or Vine would terminate his contract with the team on mutual interest, to then be signed by a different squad (such as Ruben Guerreiro into Movistar, officialized weeks ago).