My principal gripe is that my skis are heavier than I'd like
for carrying from my car to the lift.

Long ago I noticed that Telemark and AT (alpine touring) skis
weigh less than downhill skis of any type.

What would happen if I put downhill bindings (e.g. Marker 13.0)
on good telemark skis such as Atomic TM:X or Fischer Stingrays?
One bonus is that these models cost less than most downhill skis.

Or what about an AT ski such as the K2 Shuksan? I've seen those
at Kirkwood, but neglected to ask the owners about them.