No - I would not. I would not consider it my place to go. I think funerals are for friends and family and those who support them - not people who hired the dead person for some nebulous service like therapy. It would seem intrusive to me. I would feel the same about a therapist coming to my funeral - not their place to do so. It would have nothing to do with death or caskets or anything about death in general. I am not saying it is universally wrong - just I would not for that reason