But,
I think OP is concerned of his personal security.
Where the beneficiary and his/her relatives may threaten him (physically) once the knowledge of him owning bitcoins is disclosed.
Oh you mean that OP wants to pass some coins to some beneficiaries, but is worried that he may be threatened by them?
Well, it's a personal situation so let's not go deeper. But, it makes me curious because if someone wanted to give me bitcoins, I wouldn't threaten them.
well suppose it is 50 coins. The person due the coins may want it now for fear of a true death spiral. 🌀
If you told me you had a lawyer holding a trezor with 50 coins in it waiting for you to die so the lawyer would hand the trezor to me.
I likely would want some of the coins now just in case of a price collapse.