Just have to report back and celebrate that I've been successfully pump weaned for two weeks now! WOO-HOO! After 13 months ... it's awesome to go from 9 to 5 and not have to haul out the machine. I never thought I'd be so happy to have an uninterrupted work day ;-)
My LO (15 mos) still seems happy with his nursing when we are together (morning, after daycare pickup, and bedtime, and still several times overnight). I will say that he seems to get a little frustrated and impatient now on my lesser-producing side, which was always appetizer-boob anyway, so I'm guessing that the pump weaning did bring the supply down enough that he's not satisfied with it anymore. But he seems happy again when we switch to the other, so I guess overall it's not a problem.
Thanks especially to Bfwmomof3 for all the practical tips and suggestions!