Adding meat is the best option
This is the best bun cha in SG and the closest thing to the one in Hanoi I had
The soup had proper smokiness from the well charred meats and the pork slices (or at least 30% of them) had the perfect bouncy slightly gelatinous bite. Unfortunately some of them were abit tough
Meatballs were good too, firm and crumbly and substantial
Worth a try