[keycloak-user] Using urn:ietf:wg:oauth:2.0:oob

I am investigating the possibility to obtain the authorisation code from another channel to hopefully remove the need to have the user log into keycloak from a redirect the client initiated. It does seem like section 2.4.5 Redirect URLs (specifically the use of urn:ietf:wg:oauth:2.0:oob) allows for this. Where in Keycloak can the the authorisation token be obtained in this case? Can it be requested via API from another trusted application? Is it possible for a user to setup consent beforehand, then when the client asks for authorisation it is returned immediately instead of waiting for user interaction?