Shotcut also has a built-in Convert to Edit-Friendly feature that can turn an HDR source into SDR for editing purposes. Granted, it puts you back in the SDR world, but depending on the video game being played, the difference may not be terribly noticeable. Hopefully the audience will be more interested in what’s happening rather than how bright the screen is. But I understand if HDR is a non-negotiable.
I am not familiar with LumaFusion. Resolve uses a node-based system that is powerful but also a large concept for new users. Shotcut is not node-based and keeps things pretty simple. But it’s still very powerful for people that take time to understand what all the filters can do.