What about Last Rites. Would you object to a Cathoiic Priest administering on your deathbed?
If there was someone in my family who would gain comfort from it, they could bring in Bozo the clown to throw one last sacred custard pie in my face while singing three verses of "My old man's a dustman" in Swahili and hanging from the ceiling by his testicles and wearing an aqualung.
It will be just as effective and just as pointless.
I don't foresee that as happening, as I've never identified as Catholic even when I was a believer, and to my knowledge they don't do this for non-Catholics unless perhaps by request.
Anyway ... I would object to any sort of shaman performing rituals when I'm trying to die in peace.