Yes, you can link several sponsors on one card, when you click through to payoneer to signup for a new card with your second sponsor, there will be a link saying "click here if you already have a payoneer card".
As for holding over $10k on the card at a given time... Come on people, use wire transfers. Don't want it in your USA bank? Open an offshore account. It's not difficult or even expensive, and at least your money will be with a real big-boy bank.
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