Sorry to hear this as I’m not familiar with VA. You can always go to a top cancer center for head and neck, if you want, but sounds like your husband may work as long as he can, and be treated locally? Loco-regional matasteses sounds like the lymph nodes or other nearby structures? Try not to worry too much about distant Mets, at this time, as it’s not an easy process to develop, and at least his scans show none!
Are the other oncology doctors on board with chemo? Maybe Cisplatin or others? Dental guards, etc.
I agree, as it sounds like your husband is ready to start! The mask can be made, and treatment start soon after. I had one made on a Friday, and started on that Monday!
Good luck