Well it sounds like you have an interesting concern here but ....   for my understanding there is a bit missing.

Are there any statistics that compare the average tongue length of each type of bee?  I was not aware that Apis Mellifera would have a materially different tongue length to say Apis Cerana.  If that is the case then is it not possible that red clover (as cited) depends on a different insect or method for pollination?

You say "So when the Minnesota poster bowed to political pressure and showed a native bumblebee in every panel of the poster of "bees", they did a huge disservice overall."  I beg to disagree.  They did a huge service.  The poster was to communicate information / a concept,  and they related directly to the target audience, the general public.  The general public can identify with a bumble bee, they know it is a bee.  Any other type of bee could be a wasp, a hornet, a fly ....  who knows.  A bumble bee is certain.  Effective communication and that is the goal.

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