Oh you mean that OP wants to pass some coins to some beneficiaries, but is worried that he may be threatened by them?
Let's be realistic here: if enough people create a timelock that makes someone rich ones the time expires, some of them are going to get killed.
the defect I perceive is that if I set it for a long time, I could forget and still alive and the transaction will trigger.
Just write it in your agenda: even if you use a paper agenda, at the end of 2025 you write: "timelock expires 2034", and each year you write that in your new agenda. That gives you many years to move your coins and create a new timelock.