I would certainly start off with attempting to use the MCP3204GpioProvider as-is just to see if it would work.
If not, I'm sure you can adapt the MCP3204GpioProvider implementation and create a version of the class for the MCP3202.
Its probably easier to do this than coding the SPI from scratch. Plus if you do end up implementing a MCP3202GpioProvider and pin class, you can contribute them back to the project :-)
Thanks, Robert