The M2 ssd here is fast enough for a few HD video streams, and the video card can handle a max of 4 displays (including the laptop screen... although it can be 'tricked' into more with additional hardware). Support for DisplayPort™ 1.4a means you can connect a range of video hardware.
For DMX, you only need USB wich it has (you will need a USB DMX interface as well, like: DMX interfaces)
I treid to serch for information on how this laptop manages the onboard ipu VS the dedicated gpu, and I didn't get a clear answer. It appears the laptop screen is wired directly to the igpu (very common), its just unclear how well it can deactivate the igpu to use the dedicated. Since its a newer model (has a rtx 4060) it should offer a tools for using only the dedicated GPU (this is the best option for Isadora).
Are you able to test this machine?