For myself, I don't think PuristSPro will have any meaning to my family beyond my lifetime so I will be buried with something modest, something that represents PPro.
IIRC, Halloween, is more formally known as the evening before All Hallows day (All Saint's day). Whether dressing up, drinking alcohol, eating sweets, saying "trick or treat" is paying proper respect to the spirit of occasion is up to the individual.
But yes it has become just another big commerical holiday
Best, Mike