There is a desire to reduce the number of confusers.  3 confusers for audio processing & music display is overkill, taking a lot of space, & taking a lot of power.  The problem is the dual HDMI raspberry pi only supports 1920x1080.  

It definitely would be better off with a full sized PC, but that's a lot of money for a lion.  Mini PC's with dual HDMI are only $200. 

https://www.amazon.com/Beelink-MiniS-4-Cores-Processor-Computers/dp/B0B3DYQ693

With no more raspberry pi's being made, the $200 mini PC is a compelling solution.

The HDMI to LVD converters take an analog SVGA signal, but this would not allow addressing the RGB cells.  There are ways to go from USB to HDMI output & from SPI to HDMI output but they're all more expensive than a raspberry pi or a full sized PC.

https://github.com/techtoys/HDMI-Shield/tree/master/Ra8876_Lite

The lion kingdom was sort of grateful it didn't buy a trackball.  There might be some accuracy to be gained from it, but the mane problem has proven to be space for the trackpad.   1 solution is not to play anything in the upper octaves & use that part for the trackpad.  Another desire with the trackpad is a reset button.