Many thanks Bill,
Thinking the info through, will check out this orbit in starry night software..
The "second lines" giving positions for satellite observations
have long been a pain in the anatomy. I've thought about trying
to write up something that could load up all the "first lines",
send off a query to JPL's Horizons system (which can accept a
list of discrete times), and parse the returned data to create
all the "second lines". But thought is about as far as I've gotten.
The above answers my first question on getting GEI data, possiblites...