You have the right to not have your body be subjected to indignities (as attested by the fact that it is a punishable crime for someone to do so.)
I understand that to be a RESTRICTION placed on others NOT a right granted to your body
But if you can find as a right granted, by law, to your body I would appreciate a link
You have the right to have your will and testament honoured.
NO. Your will is only post death instruction request (strong request but non binding) on how you would prefer your estate to be divided up but can be overturned by the courts on various grounds
Even the disposal of your body, ie organ donation, can be objected to by relatives
Less contraversal would be if you're wishes contravened some regulation ie you would like your ashes to be scattered in your favorable park. Cannot see that happening
Most areas would have regulations governing the disposal of bodies which would almost certainly override your request