I'm thinking that the LED is part of the switch and might not be easily replaced. Take a look and see if it's replaceable.
You can rig another led in the case or something USB with a led. https://www.ebay.com/itm/403893218638
The 5070 I'm looking at right now has a red LED on the SSD.
I think the LLM need about half the parameters in vram so a 30b model needs a video card with 16gb of vram. The 13b models need 8gb of vram.
Those aren't cheap.
I'm running a lot more on a J4125 and it's been working great. I don't have 4 users playing in parallel.
You should be able to get this to support hardware quicksync. However, if not you can try:
Dell T20, 2x Wyse 5070, Optiplex 3000 thin client. HP 600 g3 that total about 85 watts. A couple gigabit switches for about ten watts.
Trying to keep it under a hundred watts, but I go well over the T20 and/or the HP have heavy load. Luckily none of my workloads use that much CPU so it's under a hundred watts.
I have crazy expensive California power so with A/C each watt costs about $4 a year.
Get a different version of the card. I have one of those cards and one of my computers refuses to boot when it is installed. A different one works fine.
The problem card also works in a different system.
TDP is a measure of power usage when all the CPU cores are at 100 % usage. Most homeland sit idle almost all the time. Basically TDP is mostly meaningless.
You will find that your 9th gen Celeron idles pretty close to the same as a i3, i5 or i7 of the same generation.
The cheap upgrade would be an i5-9500 in your existing system with perhaps some more ram. Unplug the other system as it's really slow. Upgrade your drives.
The problem with a newer low power CPUs like a n5105 or N100 is a lack of pci-e lines and SATA. If you want multiple high speed m.2 and non multiplexed SATA, you need a more standard CPU. Consider a 12th or 13th gen i3.
I'm not against n5105 or other low power systems. I run several. They just are not the best for a NAS.
Get a Nvidia GPU or for less power get a n100 mini PC and run the media server there. A n100 can do a few transcodes in parallel and only use five watts while doing it.