Vietnam Motorbiking Phong Nha to Khe Sanh

I’d like to motorbike a part of Vietnam in August. I don’t have the time to motorbike the whole north to south, but would like to do a chunk.

I’ve been recommended two “must-see” routes, the Ha Giang loop and Phong Nha to Khe Sanh. While I have some motorbike experience, I don’t think I have enough to do Ha Giang safely during monsoon season, but Phong Nha seems more safe/reasonable.

The issue is, I’m travelling solo and want to do the tour with someone else, whether another traveller/group or formal tour. How easy would it be to get to Phong Nha and find someone to join/a tour? I’m not sure how common that specific route is. I’m also probably okay to extend the route to Hue, but don’t want to go too far south on motorbike.

I’m thinking I’ll fly to Dong Hoi, go to Phong Nha and figure it out there. Is this do-able / worth it? Appreciate any insights.

Vietnam Motorbiking Phong Nha to Khe Sanh