Now, if you still want to gamble but you don't want to become addicted to it, one of the things you should do in my opinion is:
1. Only set aside an amount of money that you will use to gamble in a casino.
2. Don't think that you will gamble to make money, because if you do that, you will surely have a problem later.
3. Just spend a few hours staying in a casino to gamble so you can avoid what you don't realize is wasting time that you should be spending on important things instead of gambling.
About your suggestions, I support and already practice the first two mentioned.
In fact, this is the minimum necessary to have control over addiction.
However, regarding the third item, I believe that a person can spend a lot of time in the game and not be addicted. If, for example, she manages to control her expenses well and also control her losses.
I have friends who spend an entire Sunday afternoon playing soccer, and they aren't addicted or have any problems because of it.
So, even in gambling, if there is self-control, I believe that the time spent is not an issue.
Of course, that time spent gambling cannot be getting in the way of other day-to-day activities.