How do I netplay with no lag on host in spectator mode?

I want to run a netplay host on a Raspberry Pi + CRT Display while having a spectator on the PC to capture the gameplay. It lags a little bit when I start a netplay host even in Stateless mode. I assume this is because it still needs some time to process input of the potential second player.

The thing is, I don’t want a second player. I just need the spectator on PC to capture. Is there a way to set up netplay specifically for a spectator and not for another player to eliminate the lag on the host?