Its working for me, in Sling Model class - use @Self for Model class variable and pass to ModelFactory Exporter.

@Mahesh_Gunaje  - you can keep/save multiple access token on all different Publisher P1, P2 (agreed token will be different and they are their own lifecycle and valid for 24hr). While request will come from LB, it could get connect on anyone of Publisher P1, P2, utilize the existing saved token for ...