yarn is really cool, go for it!

Also, if you are looking for some lightweight and unfinished client, I could recommend the PHP script I'm using to reply here.
Started as a raw PHP script to twt and reply from my phone, running from a shared hosting, then evolved into twtxt-php on Github and parts of it were merged to
https://github.com/sorenpeter/timeline

And it's live here:
http://darch.dk/timeline/

The idea behind it is having 1 instance, and 1 .txt for each account, not using any database but only the .txt. Kind of experimental although works good enough 🙂