You're crazy to ask your boss to pay you out. The system is there for times like this so I would advise you to use it.
The injury has already been reported to WCB (it must be reported within 48 hours) and especially since your accident is severe like it is, you should never deny a WCB claim.
For example, what if you cannot work for 3 months, you need continuous rehabilitation and your foot is fucked for life?
Answer: Your boss is not going to pay for that. WCB will be there for you, even though they ARE a big pain in the butt.
And yes WCB is 80% of your wages, but they dont take tax off so you almost get the entire wage you would have gotten.
"I believe that banking institutions are more dangerous to our liberties than standing armies. If the American people ever allow private banks to control the issue of their currency, first by inflation, then by deflation, the banks and corporations that will grow up around the banks will deprive the people of all property until their children wake-up homeless on the continent their fathers conquered."
-Thomas Jefferson 1802