Spoke too soon. What I said earlier worked on my laptop, but doesn’t work on my desktop.
I agree with the poster above, that maybe you shouldn’t change things that we are so used to. Using the Super key for the application menu is almost second nature to me, and I think for most people. Before it was made default behavior in KDE, we used ksuperkey to accomplish that. And of course, it’s the key that brings up the start menu in Windows, and has been for decades.
TL/DR : Please let the super key bring up the application menu/launcher on the default panel. Or at least, give us an easy option to choose between that and the one on the latte dock.