regardless, I won't really care, and I wouldn't call it "defilement" nor will I worry about "resting in peace" either way. Disturb the dust, muck about with the frozen remnants of my carcass...unless I'm truly mistaken, it won't have anything to do with me at all, any more than ripping out my organs to benefit someone who could use them, using the meat to teach anatomy to doctors who will save lives...or hell, stealing the cadaver, dressing it up in women's lingery, and placing it in the bed of a drunken med student to scare the snot out of him.
I don't care- that's not me. It's my clothes.
Although I do think the whole "playing a joke" thing is somewhat tasteless, and at the very least should not be done until after my family has gone through the memorial service.
Then again some of my family members are so tight assed only bats can hear them fart-maybe it wouldn't be so bad if practical jokes were played w/the meat, if only to sacandalize them, and give them something to "harrump harrump harrump" about.