Thanks all for the help and thoughts. I agree that blocking inbound 911 is probably not the way to go. I could redirect to my Google Voice number and go through its normal call screen, but that's only marginally better if at all.
Basically one of the reason I've gone the GV route in the first place is to minimize, if not eliminate, the unwanted calls I get nearly daily. The national "do not call" call list is a joke and there are too many ways around it anyway. So, GV seems to be doing its job in that regard. It feels good to block a number in GV and know that I won't run to the phone for them anymore.
Then there's 911. CC handles that, but did I close one door just to open another for unwanted calls? Will I get junk calls from people thinking I'm in NY on the CC number? Am I worried about a problem that doesn't yet exist? These are questions I ask myself.
If anyone has any suggestions on how best to get both the privacy I want and the proper 911 service I need, please pass them on. At the moment, it appears that keeping my existing configuration, not blocking inbound 911, and hoping I don't have a spam magnet on my CC number is the way to go.