With liver cancer(HCC) and Presumably advanced chirross (given his prognosis of a short time to live) hopefully he is being treated by a hepatologist knowledgeable in all aspects of his condition.
There are salvage treatments on the market currently for those that fail Epclusa, however it does get tricky with what his particular situation presents.
What trial in particular was recommended and by who?
You should be working closely with a hepatologistvat a liver transplant center. Right now his primary concern is his liver cancer. Has he been approved for a liver transplant and is he on the list? Do you know his MELD score? The MELD is how patients are ranked for transplant priority. Patients with HCC are awarded extra points. Once he has a transplant he can then be evaluated for which treatment for hep c will work best for him. Also with a new liver he will be easier to cure.
Best of luck to you both
Be guided by his hepa in all aspects of his condition. They have an excellent liver clinic at the Mayo.
Best of luck to you both.