I have been plugging away on this during the lockdown and have made some progress. Through a few iterations, managed to get a linkage that works on the engine whilst clearing all the sensors etc that is in the valley of the engine. This way, it can work on anything from completely stock engines to full race setups.
Having old F1 races courtesy of #f1tv playing in the background was helping with the V12 sounds to keep me motivated.
Even made a little video of a simplified version of the linkage.