It's better than that. That page say that his work of cross-compiling python for arm is already includded in OpenEmbedded. So if someone manages to set-up the official irex openembedded toolchain, it should "just work".
Anyway, I don't have the space nor the time to try OpenEmbedded, but as that page says that the only problems are because of crosscompiling, and I'll be native-compiling in scratchbox, it should also just work :-).
Good news. Thanks :-).