Then the issue you face is that you’re pulling from multiple eras of cosmology and trying to reverse retroactively apply cherry-picked pieces of all of them into the very places of your own choosing.
This gives us an opportunity to wrap this back around to our original points about Seth:
In the Seth story in particular, "plane" is used as a stand in for "realm," as indicated when Seth claims that the destruction of Asgard's Rainbow Bridge cut them off "from the mortal plane." In Thor's cosmology, the Rainbow Bridge connects Asgard to Midgard (Earth's realm/plane). With this context in mind, we can see that Seth's only mention of "infinite planes" was when he boasted that nobody in "infinite planes" had ever assembled an army as large as his ow. This is just the same as saying "Nobody in infinite universes of the multiverse has ever had an army this big!" There's never any indication infinite planes are actually in danger in the story at all. The only time multiple planes are directly affected in this storyline, they specify that they are talking about the planes within that reality. So, knowing that "plane" actually means "realm" in this storyline, when we further reason that "reality" means "universe," then this clears up all inconsistencies. By this, Seth was only threatening every realm within Marvel 616 (i.e. the realms of Yggdrasil), and this also satisfies with how his battle against Odi caused shockwaves which "ripple across every plane of reality.", when those "planes" were meant to be read as "realms" and "reality" was meant to be read as "Marvel 616," then this feat would be dramatically more consistent with all of these characters more usual operating levels.
What you would need is that within the context of a story that actual multiverse was in danger, and not just the local universe we’ve borrowed scans from two dozen comics to reverse engineer that it actually meant something more.
As for RKT. Like above there was nothing that showed him to ascend to anywhere near such a massive scale you’re implying within the Ragnarok story itself. All that we know is that he gained Odin’s power+benefit of humanity and broke 9 universes out of a cyclical loop by cutting a thread.
If you want I can get more into all the logical flaws of the Yggdrasil scans here, but the important part would really boil down to trying to scale anyone who has ever threatened it or threatens it as being as high or greater than the highest cosmics in Marvel Multiverse based on your random scan grabs.