This may sound incredibly naive but if separating is on the table what have you got to lose by trying to save your marriage first but do the following anyway?
A) Telling your husband why you believe jw's to be "wrong" in their world view - ARC/Generations/False Prophecies etc.
B) Telling your kids the above.
C) Providing an alternative for them - education - non jw friends - being decent citizens - fun - helping the less fortunate - value of money?
If you aren't baptised then "everyone" knows you haven't bought into the religion including your kids and husband. Tell 'em why!