Player Attack Move (need help/explanation)

So I have bound A as player attack move and I want to be able to press A-MB2(right click) to attack champions/minions. This is the most comfortable way for me to play. But sometimes I missclick and I walk to the spot instead of attacking the designated target. So I went to Options>game and checked off the (attack move on cursor) option. But this allows me only to press A-MB1 (left click) to attack the designated target. So I have to swap between MB2 and MB1 while kiting and it does not work for me at all. Is there any way I can bind A-MB2 to attack the closest target if I missclick? literally losing my mind over this issue
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