Hey Mo,
I have no information, just a question. Do termites get into dry wood? In my area, I live in northern Nebraska we see a little termite damage around mudsills and floor joists that were set too low and occasionally at the bottoms of exterior studs. But I have not seen termite damage in wood that has been kept high and dry. If this is the case in your area couldn't you use a little sap wood in the beams and other interior applications?