Hi Ivano,
That would be very interesting! I don't have the capacity to do much porting myself, but I can contribute a lot of knowledge and code.
One potential hurdle is that some of the present code is written on top of Atmel libraries which were licensed for use with their AVR32 only. I do not know what the original libraries might be. The changes and improvements done in the Audio-Widget / SDR-Widget project are substantial. But to reuse those efforts on other HW we should be able to argue that it wasn't an original Atmel contribution.
Børge