Communication preferences - how to easily give members the option to change them?

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Does anyone have any suggestions of how to do something?

I want to give members more options for how I communicate with them, and to achieve this I've created 3 new custom profile fields:

(1) Newsletter subscription (monthly): Yes/No
(2) Digest subscription (weekly): Yes/No
(3) Promotional email subscription (monthly): Yes/No

I already have approx 10,000 members and I want to email them out of courtesy to get them to set their preferences so that I don't annoy anyone with unwanted emails!

Is there a way I could do this with minimum hassle? If members could update their preferences without having to log in that would be perfect! I don't know how this could be done though.

One option is that I could send them a link to a survey form containing the 3 options. They would fill it in and the results would be emailed back to me. I could then update everyone's accounts manually. This could be a neat solution if not many people respond, but if I get 100s of responses it will cause me a load of extra work.

Any ideas on a better solution?