As an experiment, I tried to build the current release (3.7.3) in Fremantle + libetpan & friends from extras-devel. It built fine (./configure --enable-maemo is all it took) and the resulting binary (I haven't packaged it or anything, just copied over and ran from the command line) works :-)

There are various minor UI glitches here and there (like lack of full screen) and it lacks PGP (support due to the lack of libgpgme at the moment), but otherwise it's quite usable: