Dezynco, that's good advice. It's not clear whether the dovetail ramp will fit the Contender but it's worth looking into. In my phone conversation with the sight technician at Williams, he offered rather terse answers to my questions and didn't see fit to mention this ramp, which is a Williams product. I've seen more responsive vendors.
My late-model G2 has two screws on the front sight while the Williams ramp has only one. That's probably OK since this is only a .22 LR barrel, but I wouldn't want to depend on a single screw to hold the sight on my .44M barrel.
I will continue researching and will get back to this thread when I have some answers. Costs are starting to add up (Williams ramp + Williams FP-TC rear sight + Lyman Globe = $150), and at some point I just go with a scope and call it good.