This could be extremely valuable for the field, and profitable for AG. It would be great to bring these to ICCF-17.
Measuring ~1 W is not difficult. I recommend a Seebeck calorimeter. It simplifies matters and it has a large s/n ratio compared to other types, in this range of power. At ~10 W or above it does not matter what kind of calorimeter you use. - Jed