Garmin chargers are hot garbage, even the official ones. It’s always recommended to buy at least 2 at a time, since they break so quickly.

The puck style charges seem to be a little bit better, but I’ve had ones that only worked 1 time.

I installed from one flash drive with the image (on ventoy) to another flash drive that was plugged in to be the boot drive. On a cheap USB2 drive, it’s unusably slow - so make sure you use the fastest drive you can

I don’t use VRR, but I meet the rest of your criteria

Electron apps were the biggest pain pont - I would be typing in discord and there was noticeable lag and letters would disappear until I have several characters beyond them. I worked around this by using discord on their website in a browser tab.

Not sure which update resolved this, but it’s now working as I expect it to, so I think if you choose to use a Nvidia GPU, you should have an okay time. I would just say to consider a beefier AMD GPU as well, since they tend to have much better driver support in Linux