The airside connector just got extended. It is a pretty long walk from T7 to TBIT, but given that my connections are often for 4 hours or so, I intend to try it next time I am there. Loungebuddy says I can get in with my UC membership, Star Gold or an international business class ticket, departing only. Priority Pass will also give access to the KAL lounge. We will see if those work in practice, or if they impose limits.