I wonder if citymapper will get onto the case of making the two card shuffle simple using their app which can do NFC (with permission / engagement from TfL).
Citymapper could also ask for permission for qualifying users of their pass card to have qualifying travel refunded to citymspper (their pass card is really just a contactless MasterCard and city mapper passes through some charged but not others depending on pass tier..from none/suspended through to multiple zones weekly plus bike/taxi)