I dont know if its legal or not but if a loved one asked me to do it, im doing it regardless. Im done obeying laws.
This is similar to something I've been thinking about for a few years. I like to travel and camp, hike, motorcycle tour... I think when I kick the bucket I'm going to be cremated and have my kids each take a portion of my ashes. My request will be that if they're ever going someplace cool they take a little pinch of me along and spread me there. Maybe it's someplace I've been, maybe someplace new. Just a "Dad would've liked this hike." or "Dad would've appreciated this view..." That kind of thing.