If ATC want this, they will ask you (at about the time they expect to to come visual) something like "in the event of a missed approach, would you accept a visual circuit?" If, after assessing condx in the circuit area, you agree, they will then respond with that as a requirement.
Plan for and set your alerter to the published MAP altitude until you are cleared for something else.
If you dont agree, the standard MAP will always be available. Contollers especially in WLG use it a bit.
It is your choice, and it was quite simple I thought. Thats how I understand it anyway.
Tarq57 or someone may be able to elaborate further?