Proftech = you hit the nail on the head at the chief reason my wife will yell when she hears this is my plan. she saw me struggle with issues I was having with disconnected calls, etc. with GV, so any suggestion I plan to do something similar will not be received well.
Forget I mentioned a business line, it muddied the waters - it is just another home line that she uses for work so she can have a separate number and vmail, thats all. I did see she averages maybe 1000-1500 outbound minutes per billing cycle - charter doesn't track inbound minutes.
Changing both home and her work numbers is also not an issue, so we can take that off the table.
Having said all the above, I don't want a solution thats going to have me doing all sorts of complex configurations that fail on a reasonably regular basis. her line is her lifeline as a home-based rep. when it goes down, she's dead in the water and my life will be miserable scrambling to get it back up.