My husband was Stage IV inoperable. I learned more after the fact that places like Mayo, Univ of Pitt, and Huston, may had offered more treatment options that our center did. He did have chemo indefinitely but no feeding tube. He got about 7 months quality of life, then sick for the last 6 weeks. I would not recommend you allowing them to tag you as pallative. Too many medical people don't take you seriously when they see pallative. Good luck glad to hear you are talking with surgeon and Gastro doctor directly.
Keep your armour on and don't give up hope.