I don't think putting libflashplayer.so even if is correct one will solve it. Why? The biggest difference between flash 9 and 10 is that. The second has more to to with hardware and relaying on platform specific drivers. That's why Adobe had to work closely with vendors to make it happen.

Flash 10 trying to get access to GPS, front camera and internal accelerometer. Obviously it fails on N900 since nothing has been done for this device.

This is how open Maemo on N900 is . For sure not even a little bit more than flash. Even if Adobe could open flash player nobody except Nokia is able to port it here. But keep dreaming... or buy another device.