There's no such thing as 'burning your receptors up'. With regards to side management, ease of application etc I believe that amping up a certain GLP should be preferred over using multiple of them. Maybe complemented by adding an amylin analog like cagrilintide.
I just read the rest of this, that's basically correct. Running more than 1 GLP-1 is redundant. It makes no difference for benefits. The dominant GLP-1 will dominate the receptor sites, and you'll get little benefit from the other that isn't already achieved from the dominant one.