It's easy... there's several files in update.zip... you'll need to extract system2.zip and add patched su (suandr) in it. Then replase old system2 with a resulted one, and add a line with chmod command in "update.sh" in the root of the file. That's it.
As for double reflash.... don't know. I root my EE on first update (badger? or what name it were?). And after that the only thing i need to do is patch "update.sh" - 'cos it reset file permission after updating.



------------------- big news -----------------------
Finally after 2 weeks of research I found the way to use e-ink, so probably I'll be able to bring web browser to e-ink screen (and many other things like this).
I'm still looking for people who can help. Android (or C) programmers needed. If there's no good programmers, probably I'll need to hire someone in my city (thanks it's not so expensive as in USA) and give him eDGe to finish a job.