i highly doubt you will be able to use it without drivers. I have a K750 and you need the drivers.
What i have is an Intelligent Stick which is very small and fits into you wallet. They come with a credit card sized holder which holds two pen drives.
Maplin have them in stock but i got them from a shop called NetPCDirect but they have closed their shop for the summer. A 128MB is for sale at 19.99, they also have other sizes.
A good mobile phone forum is click here