I think that, unfortunately, the idea is condemned from the start. Maybe one day...
Some rumblings about my opinion:
Unless you hire some of the members here in the forum, continuosly, you will never get the definitive evaluations that you are hoping for (or at least me under the "EEVLab" flag). TE is a very small niche and one needs hyper special guys to comment freely on them (going overboard of TE is even worse as, one of these days, we'll be here discussing coffee machines and, at that moment, I'll know I've reached my stop).
Having such a supposedly "serious and methodic" evaluation might detract members from commenting: the beauty (and the bad) of the thing today on the forum is that, sometimes, you have people participating in a discussion that are orders of magnitude away in terms of knowledge But that doesn't detract them from commenting. (it's like talking about a football game, anyone is entitled to they opinion and reserves the right to express it). Without comments from members you'll loose the "community contibution" that you are expecting.
OTOH, a "EEVLabs testing/certification seal" might be destroyed in seconds if a forum guru finds an error or totally disagrees with what is being shown.
I agree with a "EEVLab" brand (seems kind of cool!), i think it may start to have some credibility BUT you have to go with the crowdsourcing way.
Things like Rudi's enormous work
https://www.eevblog.com/forum/testgear/functional-comparison-of-rs-rtb2000-siglent-sds2000x-and-keysight-dsox1000/ is something that you should encourage, help, guide and/or even reward with a "EEVLabs seal".
This could make some of the big gurus here do similar contributions in order to have something with the "EEVLabs seal" in their curriculum. There are many already spread all over the forum that are just not organized or filmed as a videoclip.