My plan was from Danba to Yanding however i understand there no such direct bus

i found out the possible risk route is by bus or mini van (local bus) from Danba to Xinduqiao to Daocheng to Riwa (understood each arrive town may need to stay overnight due to arrival time may late) ... Is it possible or I need to go Kanding to catch from Kanding to Daocheng?

Or the possible route from Xinduqiao to Litang to Daocheng to Riwa?
Really need help.
TQ