Create a 2-step opt-in with AWeber OR alternative methods?

One of my clients is a restaurant owner. I manage his list using AWeber. I am trying to figure out the best way to configure an opt-in system for his website.

Here's the situation:

The restaurant sends out a quality newsletter twice each month. The subscriber gets a free dessert for signing up. Subscribers can also get a free entree on their birthday and free appetizer on their anniversary every year if they provide their birth month and day and anniversary month and day.

I do not want to present at least seven fields in one form to a prospect - the opt-in rate would surely suffer.

What I want to do:

I want to make opting in a two-step process. The first step would be a form with three fields: email, first name, and last name (I know some marketers swear by one field only, but this is a small restaurant with a loyal following and I think in this case, three fields is appropriate). The names fields will not be required fields.

The subscriber confirms and receives their certificate for a free dessert for signing up.

Several days later, the autoresponder sends a message to the subscriber explaining the benefits of providing birth and anniversary dates.

The problem:

(method #1) Configuring AWeber to allow the subscriber to add their birth and anniversary dates would require a developer to work through AWeber's API.

(method #2) My way around that is to have the subscriber sign up to a second list (with Confirm set to "No") and use the automation rules to remove that subscriber from the first list. The downside is that the subscriber will have to fill out all seven fields - and I don't like that part.

(method #3) A third alternative is to have someone modify the form code AWeber provides and break the signup process into two pages. That is, form part one will have email, first name, and last name. After submitting that form, the data is carried over (by a script) to the second part of the form where the remaining four fields can be completed.

My two questions:

A) Which (if any) of the three methods would you choose?

B) Do you know of a different method that will achieve the same thing?

Thanks in advance for any help!