maybe slightly off-topic:
I think if we would actually be able do do things like that we should leave Maemo as a platform completely.
Let's face it, Maemo as a software platform is so full of compromises and flaws that it's not worth using it when designing a new mobile device from scratch. The only argument that speaks for Maemo is that it's still the best platform out there because it's the only one which is half-way free and half-way alive.
There is this wild mix of software from different Debian releases somehow patched together in order to make it work. If that wouldn't be the case projects like kernel power or CSSU wouldn't even be necessary because their features would be part of the standard distribution. Porting all these problems to a completely new device doesn't seem as a good idea to me.

If we'd ever be able to design and produce our own N900 successor the software platform should be something that already exists and that's absolutely free (as in freedom). In my (biased) opinion the best idea would be to start as a Debian sub-project like there was Debian-eee for netbooks when they were new, which eventually was integrated into the Debian distribution completely. Of course when it comes to the user interface Maemo could be a role model in many aspects but if there is a platform that could actually be used as a fork source it should be Openmoko.