Is it out of concern for them- that you don't want to traumatize them seeing your corpse? Or- is it to make them worry? I imagine someone just disappearing will be incredibly worrying for a family. They'll no doubt consider suicide anyway but they may also consider foul play. Authorities may well focus on the family and friends if they suspect murder. Murders are frequently carried out by someone known to the victim.
Either way though- if a dead body is found, I suspect authorities of any country will want to find out who they are and notify their family. I expect they will try and obtain identification of the body from one of them. That concerns me too to be honest. I would plan to go at home and leave things like my passport ready to access. I also thought about requesting they go from dental records and leave my dentist's details but ultimately, I doubt we can control what they'll do all that much.
If you don't want a funeral, you can pre-pay for a direct cremation. Or, you could leave a note expressing your wishes and hope they are caried out but ultimately, there's only so much we can do to control what happens after we die.
