Sorry but my body is mine, I don’t believe in any afterlife, I believe all that I am is in my body. And I really hate the thought of anybody doing anything with me after I’m gone, so however useful medical science might be I absolutely do not want that. Take out whatever organs can be viably donated and cremate me as soon as poss.
Probably a direct cremation like Bowie. One of my more interesting work days involved a tour behind the scenes at a crematorium - I got to see the whole process right through to the Cremulator.
I am tempted to buried in my home town cemetery along with other members of my family. It’s a beautiful place with a view of the mountains, a stream and most importantly it’s home to Red Squirrels. They now offer unmarked woodland burials in the Victorian part.