I got the latest snapshot on an uSD and it did indeed work with sudo apt-get install python3-opencv.
I then went to a 64G uSD and did as ljking suggest in another thread to rebuild opencv on the 410c with the 17.09 #283 debian release. The magnificent script provided by ljking in that thread built the latest opencv and got Numpy, SciPy, MatPlotLib and other sundries.
I did some simple testing with python3 for webcam and matplotlib and all is well so far.
No kidding, thanks U2 for the help. I owe you a few beers!