I want to learn font design so i can try and make nice Vietnamese fonts. (I know, "i want to learn to code so i can make a dragon mmo" etc) Using western style

I want to learn font design so i can try and make nice Vietnamese fonts. (I know, "i want to learn to code so i can make a dragon mmo" etc) Using western style accents for the tone marks just doesn't look right. The difference is clear when looking at hand-designed typography and signage. Semantically, the tone covers the entire syllable. In handwriting this is clear - note the elongated dâu huyền in the first image's "Còn". The western fonts used in modern digital typography make it look like it's just a property of the vowel instead, which just doesn't look as nice. (And further, gets messy with the actual vowel marks, ă â ê etc) (It also doesnt help that 70% of vietnamese signs are written in Impact.. anyone know why this is?)