Would have to be custom for sure... And with all of the lights back there it would be hard to do without loosing a lot of that functionality. I think the analog speedometer is sportier anyway.
Also, you might be able to set up the LCD in the center dash area to show current speed instead of MPG and average speed... have to check the OM.
Digital speedo can be had if you put in a gauge pod and put it there, but what would be the point of that.