No point or need to adapt n900 methods backward to the n800...
there has already been years worth of trial and error work done by maaannny people. I would suggest such backward methods only if trying to prove a point that it is do-able....a proof of concept ...best save such exploration for the troubleshooting of installed os's/ chroots or even better try some new porting of a previously never attempted os.
There are already plenty of successful methods for alternate os or chroot installation available for the n800...it just depends what you want/ need and of course the level of usability of said os/ chroot on the n800/n810 line. And of course the individual must be inquisitive enough to do some searching and reading through the sub forums for all the pertinent posts that will net the info needed.