Yes -- one of the reasons I want to use the linear pull brakes is because the original trigger shifters on this bike don't have the gear indicator windows (you have to look down to know which sprocket you're on), and the bike will be ridden by my 11 year old who I'm trying to get in the habit of using her gears effectively. (I suppose a case could be made that learning to use gears WITHOUT the indicators could be better in the long term, but I digress.)

In addition to these Avid brakes, I have a set of 3x7 EF51 brifters that I'd like to swap on. That solves the problem with no gear indicator and also gets better/newer brake pads on the bike at low-or-no cost. And they also go with the linear pull brakes. But a Problem Solver cable stop is going to be 20 bucks, give or take, and I "lose" the Avid brakes and EF51s to this bike. If I keep the cantis on it, it's almost 20 bucks for a set of Kool-Stop Salmon pads, plus another $16-18 for a new 7-speed trigger shifter, but I retain the use of the Avid brands and EF51s for another bike. That's probably the route I'll go -- keeping the cantilever brakes on it and just buying a new shifter.

Thanks for the advice!