I don't know much about the Launchpad hack (see the developers' forum) but maybe you could load the wpa key into one of its "options" and then "force feed" it into the data entry on the kindle. I do not believe there is a generic cut/paste ability.
I have also read the complex passwords/keys may not always work on kindles and to avoid mixed letters/numbers/symbols. But that might be urban legends.
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