I really like the Bluetooth keyboard. They are an old design so easy to pick up cheap. Mine cost me 30 GBP on the Bay for a new one, you should be able to pick one up for similar money. The only downside is that they need to be 100% charged before pairing for the first time. Since then I have had no issues. The nub on the keyboard is not a normal thinkpad nub, more a touch pad device shrunk to nub size. But it does allow you to move the cursor around the screen. It is not that precise to be honest! But you can mix touch and pen and keyboard for cursor positioning. Although that's not perfect.
You could use the Note for turn by turn Nav but I was only using as a moving tourist map. I have a bit of history with GPS and eInk. I made hardware mods to wire in a GPS module into the Kobo and ran Top Hat Soaring software on it. See
https://vimeo.com/67223752
The Note could do this as well, but it isn't a handy size for mounting on your flight deck. eInk is perfect for flight instruments as you need something that is daylight readable and has good battery life.