The Cortex M3 ports are very similar to each other, if not identical. The only difference is the compiler syntax required in order to perform the interfacing between the asm code and the C code, and to setup the vector table. This is because the timer used to generate the tick is the SysTick timer (on the core itself) and the interrupt controller is also integrated into the core. I have tried not to use any device specific libraries in the port layer for M3 ports so they should be pretty interchangeable.
I should open up an existing Keil CortexM3 port, note which files are included, note which #define is used in the project options (RVDS_ARMCM3_LM3S102 I think for all CM3 ports, not just the LM3S102, bad naming on my part), note the include paths, then create a project specific for your hardware following the instructions above.
If you can supply me the hardware I could do this for you for a low cost fixed price.