OK, so I did it just out of curiosity, and it was actually not so difficult to backport the aegis interfaces to the Nemo kernel.
Just booted it freshly up to Harmattan, and it seems to run nicely. All functionality except vibration feedback seems to work normally

--- edit ----

Yes, it's indeed so that haptic feedback is not working with this kernel. I keep getting this on syslog;

Jan 23 07:53:47 (2013) meegofeedbackd: MfBackendVibra: Impossible to initialize the interface to the Immersion daemon (-4).
Jan 23 07:53:49 (2013) meegofeedbackd: MfBackendBase: Unable to load handles in the current state.