The modifications to LightshowPi should not be too extensive and I recommend that you contact the authors about supporting generic SPI interface for their pixel driver instead of using WiringPi. You can link them to this thread.
Taking a brief look at their code, they use WiringPi to enable SPI userspace /dev/spidev0.0
The same can be done on our boards via enter a couple of ldto commands. The rest of the stuff should run as is. I’m not sure about the pyalsaaudio dependency failing but that should be the same as Raspberry Pi since it’s just a userspace library.