Free thinker, I think no need to do so many leceh thing. Just burn & throw the ashes into the sea.

Just tell the relatives when will the body be cremated. If they can make, they will come, if can't make it not need to wait.

If still care about funeral, then it is not free thinker / defect the purpose of being a free thinker.

Dumb into bin a bit over even though free thinker.

If the sea is to far, tanam bawah pokok la, jadi baja. Return the earth to the nature.

Not workable here due to few issues:-

1) you need an gazette / alienated land for this. Coz if you simple bury the body at any land, ppl may mistaken it as the attempt to destroy criminal evidence / mistaken the burial as the crime.

2) the left over from the corpse ( the bones ) abit annoying. If the land is use for the growing, the land need to be ploughed , when it is being ploughed, the skeletons may surface. No farmer willing to works on the lands with so many obstruction.

The only way I see it possible maybe it will be something like Bukit Cina at Melaka. The whole area ancient Chinese tombs were covered by the tall growing rubber trees.