I am pretty sure Next Car Game doesn't have any telemetry output.
With out telemetry data then there is no way to get it to work with any of the symprojects gear.
Since it is Early-Access there is a chance that they might add telemetry data. They do seem pretty open to adding new features. I asked them to increase the controller limit and they have.
Here is a video of my Next Car Game setup running triples, wheel and shifters etc.
https://www.youtube.com/watch?v=uo_bbI6n-LA