FINALLY got the replacement trigger switch in Jan 2 (I ordered it Dec 7th! - mail is REALLY being slow), and it was an OEM equivalent - not exact replacement. So, no variable speed as you squeeze the trigger. (Just on and off). Also had to eliminate the overheat thermistor (direct soldered into old switch), so the thing only has the manual reset overamp protection. But got it all back together and popped in a freshly charged battery - it works as advertized.
Then cleaned up the saw, replaced a missing shroud safety spring, and it works too. The remaining two clutch drills will serve for parts for all the other working tools.
If someone can use a keyless chuck in 3/8" let me know - I've got at least 2 or 3 now including the ones on the pictured drills and won't use all of them.