I treated for aphids ( and other bugs) in my apple trees by buying a pint of ladybugs. My family thought I was crazy but I agree with you - I don't ever want to use those systemic chemicals in the ground because the way they work will directly impact the nectar/pollen. I don't know what you can do a this point. I guess you can cover or better, spray down with water Sprinkler during the bloom to keep the bees away.
Anyway, a quick google search - the treatment might not be immediately detrimental but does impact bees longterm. I think it will have the biggest impact on your winter bees resulting in a higher probability of winter loss. The reality is how many of your neighbors do this? I think its hard to control or determine but impactful. Better education needed and we need to move away from the easy fix. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6007118/#:~:text=Imidacloprid%20exposure%20decreases%20honey%20bee,brood%20frames%20from%20two%20hives.
