
So it looks as it may have to be the slowboat from Louang Prabang to Houayxai staying overnight at Pakbeng. The boat leaves from the boat pier behind the Royal Museum tickets cost 88,000 kip to Pakbeng, where onward tickets can be bought for Huay Xai fore about the same price
Accommodation in Pakebeng it looks like a choice between Donevilasack Guesthouse or the Bounmy Guesthouse.