[keycloak-user] 1 realm multiple ldap providers with username collisions

Hello list, What would be the advisable way of handling following use case: 1 application authn using keycloak with a realm with > 1 ldap configurations But in 2 or more of those ldap's there are equal usernames. How can we for user1 make sure ldap1 is used and for user2 ldap2? I.e. for example where we could provide a login form with the username/password but with an additional dropdown that has the configured ldap providers in it. What would be the advisable way of handling such a situation? Is there any support for this that I am missing? Would having 2 realms be the only way to handle this right now? p.s. We are developing against keycloak 2.5.5 at the moment Kind regards, Wim.