Dust is the Cradle's Prey

A man wants to be the greatest mortician in the world - by giving free funerals - and secretly putting deceased-human/heads onto six-foot spider bodies to cure cancer. Vincent is an eccentric inventor and a mad genius. Eventually, he devises a way to give the first decades-long funerals by following his clients around with complimentary flowers [for years], and taking care of all their needs until their demise: [The 120 year extended co-dependent plan with free pity-parties for the vain]. It's very Edgar Allan Poe-ish and/or a bit of Mel Brooks.