I don't want to tell you what to do. That's up to you. But what I can do is giving you advice and ideas to choose.

For example:

• spread your stash in multiple wallets, not just one with all you have.
• use timelock options. In case that the individual you were sharing the "instructions to claim" will want to spend that stash, without your knowledge and before you die, they will have a surprise that cannot spend that stash until the block height x... You can move that "time position" every time when is expired.
• make it hard to "claim". FFS they must prove PoW for that. You worked hard all your life for that stash and they get it just like that doing nothing.