I actually don't think it would be too hard (I would still use profile fields, but I'd add a few plugins too and probably an extra field in the user table). You'd just do a few checks at times that users input the data. So, you have the option of doing it yourself or waiting to see if anyone else is interested in doing it. I don't see it being something a lot of users need, so I don't know that you are going to find someone to make it for free for you.
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