There are almost no active developers for the Honor 8C. Most custom ROM projects were abandoned. You will likely end up with a stock EMUI phone with no benefits.
Unlocking the bootloader on the HUAWEI Honor 8C is significantly more difficult than on most Android devices because Huawei officially terminated its unlock code application service on July 25, 2018 How to Unlock Bootloader in HUAWEI Honor 8C phone