Finally caved and ordered some TTi headers. Very impressed by the construction and fitment. Thick flat flanges, not just a ground down weld beat at each port.

I welded o2 bungs in them and had them coated locally. Color is called "titanium" and they say rated for 1800deg. Installed with my favorite sealant, Toyota FIPG and no gaskets. Also used Zircoflex ceramic heat shield around the starter.