Hep C is treatable today's medications. See link below as an example.

Most treatments take 12 weeks of taking a pill.

I had been diagnosed with Hep C in early 2000. I had a rare genotype 3 and meds back then only treated genotype 1 & 2, 3 through 6 were untreatable. I has my first transplant in later 2000 and still had my original Hep C. I was treated periodically with older meds to help reduce the viral load. In 2014/2015/2016 new meds came out and I tried a couple treatments. Finally the virus was eliminated from my body in early 2016.
However, I needed a second liver transplant because of my Hep C. So it was kind of like your question of receiving a Hep C donor liver. It can be treated post transplant today. The liver is the only organ that can regrow in us. So you only need a smaller piece transplanted and it will grow to full size in a few months. So treating Hep C is a viable way to get a donor.