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I wouldnt waste my time when there are other CU's out there... they are a bit on the consevative side, and youve already been flagged for being self-employed/not initially submitting pay stubs and tax returns.... Go to another CU who is a bit more willing to take a chance..... I wouldnt bother with a secured card, perhaps a CD or something in savings even though it doesnt make much interest but no on the secured card...
You already have other loans with them.. If they dont trust you with a CC... well... thats their problem, not yours, and you shouldnt waste time trying to get an "in" just for another product...
-J