Unless iPod can act as USB hub I don't see a chance to connect a camera (or card reader) directly to iPod. You will need a device acting as USB hub (laptop, computer etc.). And hopefully iPod software will not consider your RAW files as "unauthorized application" :bsmilie:
Get more memory cards, that would be the safest bet from my point of view. No batteries are needed and physically it's quite robust (especially CF). There are a few devices to upload pictures from cards to HDD but battery life is limited.