You also might want to check out Future.Travel for your next trip; the owner is a real OG and their offices are right next to Saigon airport:

https://bitcoinvn.io/news/david-watson-interview/

...he is also doing some visa works, but the landscape on that matter is generally pretty fluid in Vietnam and changes every few months :)

Thank you for your response and we're looking forward to further feedback from you in how to improve our services!