I've always wanted to do this, but it only really works if you have a typeset handwriting style. Regular handwriting has too many "ligatures".

For example consider just "vo" vs "io". The end of "v" ends horizontally near the top. "i" end at the bottom. So the line that starts "o" has to begin at different positions.

Most fonts solve this by starting a discontinuous "o" always at the bottom. But this looks ugly.

And that's jut two letter combinations...