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I think AMD is a decent choice, just like Intel. Scanproaudio has DAWbench charts which it seems you might have read already so you probably know what you’re getting into. Gearslutz.com has some threads about both Ryzen and Threadripper in the computer section and it might be worth checking them out.
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Off the top of my head the AMD x3xx-series (which I have) is probably a bit too old to bother with. They might work fine with Zen 2 CPUs but there are probably a few things missing, like StoreMI etc. The latest x5xx-series has PCIe 4.0 which may or may not be of interest to you. So I would probably get the latest x5xx-series even though some get the previous generation to save some money. No views on which boards to choose.
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It seems to me that using a liquid cooler is possibly a bit overkill. From what I understand there are many cases where the main benefit of it is that it keeps lower temperatures longer, but ultimately it ends up being the same if the stress/heat generation of the CPU is maintained over a longer period of time. And then conversely it’ll bring the temperature down to the idle level more slowly than air (because the liquid takes a bit longer to change temperature). So basically it might not make sense. I think it seems like more hassle than it’s worth. My Ryzen 7 1700 overclocks to 3.6-3.7GHz with the stock air cooler without it even making much noise… so…
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RAM brand… no idea. People recommended Samsung B-Die for the actual RAM itself for Zen 1 as it clocked higher, more reliably, and with lower latency. Right now I’d say the one thing to pay attention to is the Infinity Fabric speed which is tied to the memory speed. If I recall correctly it’s at one speed until memory goes above a certain speed at which point IF drops to half. I think it’s around 3700MHz on the memory. So once you go above that point what you gain from faster memory you lose in lower IF speed basically.
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If Premiere likes Nvidia then use that. I had issues with my Radeon VII until I successfully used “DDU” to delete old drivers before installing new ones. So from what I’ve seen a lot of users have had bad experiences when they switched from Nvidia to AMD because of old driver files lingering on the system. Deleting them thoroughly was a bit of a hassle without “DDU” and that’s why people had issues. I’ve had zero problems since I did this. In my case I wanted to start messing around in Davinci Resolve, and PugetSystems has a bunch of benchmarks for both it and Premiere. The Radeon VII performs really, really well in Resolve and the only two drawbacks are that it’s discontinued and draws a fair amount of power. But I got mine at less than half the price I’d have to pay for an Nvidia card with the same performance. 16GB of HBM2 memory. Pretty great. But absolutely get Nvidia if that performs better in Premiere. Should work fine with Ryzen.