A trust is probably what you want, then. Get a really good lawyer who actually does their job to put it together based on your exact needs, and don't get charged $1,000 for some bullshit copy-pasted legal template by some shyster.
There are a lot of horror stories where trusts are created and the money is legally stolen by the bank or lawyers. Usually, the original creator either dies or is incapacitated, and because the trust was written badly, no family or associates can access the trust. That shit ends up going to the bank. Whoever the trust is for, make sure they have a way to get out of it if there's ever a problem with the bank or the lawyers. In courts, trusts are legally ironclad so if you fuck it up you can never get it back,