Possibly offtopic : Binary only driver

Dear list, I work for a german company which aims now to bring a Windows client to the linux world due to repeated requests of our customers. The development is in early stage and I'm gathering information to create an install package for the customers. The problem is that the software depends on a piece of usb hardware which does some encrpytion. I get the driver by signing an NDA and therefor we can't release it openly. The problem I have now, that the driver needs to be rebuild with every new kernel version, which is released. Is there a way to avoid that ? I have developed kernel drivers for Linux for 2.2.x kernels, but things seem to have changed .... Any help is appreciated, Stefan Sonnenberg P.S.: I think many problems have such a problem, and I believe that Linux success in the customer world depends on solving such problems.