Coinb.in support time lock. There are also other wallets that supports it. On desktop Electrum, you can use time lock with the normal time we use or the Unix time, you can also use block hight. I think I saw time lock on Sparrow as well. If need be, I will check it once I am with my laptop.

@DVlog
For you other questions. If you need a wallet that can pay workers salary the way you have just listed about it, you can get a developer to create you a bit that can do that. That is not the work of bitcoin developers if they decided not to something like that.


You second question about seed phrase backup, it is the simplest thing to do. I expect no one to complain about it.