Good responses all.

OK, so what I'm hearing is, don't mess with the O2 sensor voltage--but
install a heated sensor. Maybe not perfect, but better than the unheated
variety.

What would you attach the heating element wire to? Maybe the coil? Or given
the resistance, maybe run another circuit altogether?

Anybody done this?

Seems to me, also, that there are more posts here regarding 02 sensors
during the winter months than in the summer. Possible further confirmation
of the heating problem?