My usual approach is to connect them to a bench power supply, set to constant-current mode at some suitably low value (like 0.1C or something). Obviously that's easy if you've got a bench power supply to hand, but if you did you probably wouldn't be asking this question.
Wiring in parallel with a good cell isn't a terrible idea. Maybe stick a resistor in there to limit the current so it doesn't hurt the good one.
Price used to be a good indicator of dumbness, though less so as charge control chips get cheaper.
You really want something that can charge cells individually. Unfortunately, many of the dumb chargers tend to do them in pairs.