Export as CSV while Taking Into Account Custom Fields?

I'm currently using Signup to handle a concert venue's guestlist. We offer free admission if you RSVP via the site, and that's where Signup comes in. However, one option we needed was to ask how many guests they'd be bringing, if any. So I added the subsequent fields (as well as dividing Name into First Name and Last Name so we can sort by Last Name whe nthe time came) via the instructions in signup.theme.

Now, we need a printed copy of the guestlist to give to our person working the door. The previous developer attempted to use the table_export module to ugly results; it didn't unserialize the new fields.

Could there be a way to generate a CSV file within the module, as well as taking the new fields/serialized data into account? Or at least explain where I should start? The code seems pretty dense to me (a newbie)!

Thanks!