You aren't obliged to attend the kh portion. I can understand why you feel you should but I also think you don't have to.
Here they have calling hours (wake) in a funeral home, then funeral at church, then a brief ceremony graveside (if the ashes are going to a cemetary). I don't attend anything in the kh and don't plan to. If I feel like it then I attend the other things. I have a big mouth though and just tell dubs off directly--not sure if that's the best thing but it's what my mouth does on its own. lol
It would be so awesome if you had an ex-jw friend to go with you and pretend to be a non-jw and make blunt comments when people say backhanded remarks to you. "When you say come back to Jehovah, what does that mean? Does Jehovah only live in 1 building that you have to visit?" lol