There's no USB2.0 support under OS 9. I'm not sure of the situation with SATA cards, but a little searching would probably turn up something. Try xlr8yourmac and the apple support forums

Sata card recommendations?

Get a couple cheap Sil3512 based cards / and flash them with wiebetech TCS1-1 firmware.No drivers to install, bootable. Only down side is only two ports and no OS 9 compatibility.

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You could also try trawling the sonnettech support pages, and see if they ever made a suitable card.

You're likely to have more luck with Firewire, IMHO - and FW-SATA adapters - or plain-jane PATA.