Okay, I got it.  I actually kept the "for frame in range..." loop and changed the "nextkey" line to "nextkey = rightthighFrom.NextKeyFrame()" in the copyparms1 loop (and same using "leftthighFrom" for copyParms2 loop).  Now it blazes through its routine, changing the relevant morph targets everywhere there is a change in each thigh bend parameter. 

It's also nice that I don't have to pick each thigh in turn.  It runs even if I have BODY selected.  If I tinker with it further, it'll be to try to make the script more generic so I can just run it on whatever figure I have selected rather than having to have 3 different versions for the 3 characters I use it on.  But to do that, I'll have to read up on how to code it so it uses the currently selected figure. 

Anyway, sincere thanks once again to markschum and ockham for taking a look at it!

cheers...