I am finding the built in web browser very useful.
I have my LAN router create a repeating web page that, just for a test, updates a time display every minute. Make the router put this at the top of the web page it creates.
<meta http-equiv="refresh" content="60">
The display is so clear
You can put all the power away from the Kobo (use a router, Raspberry Pi etc) and just use Kobo standard firmware - let the auto-updates do their worst!
And just use the cheap Touch N705 on WIFI.
WIFI just keeps going with the browser active.
I have some background notes at
http://www.sunspot.co.uk/Projects/sweexproject.htm - menu item 14 - half way down the page.
See "Web page control and display"