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As far as I know RIM said that dev alphas will be blocked anyway after January 30th. I cannot find the correct link to where I found this info, but I read it somewhere. I don't know how correct this info was either (I thought it was a rather official document from RIM). But if it is true, it doesn't matter when they will come and pick this up, because you will not be able to use it anyway.
But to answer your question about how to change this, maybe you contact RIM via mail. In some other posts I found that is was best to contact clientcare@brandalliance.com for any oroblems with the LE Trade-Up program. Maybe give this a try.
A like is always appreciated, but a nomination for BB Elite even more :-) You can also contact me on Twitter: @ndsmyter
you can't change the pickup date from the system, but it's not a problem anyway, just inform the courier / you can always drop off the package at your convenient time using the original shipping label
