Access Keys are usually assigned automatically on menus. C is for Centre alignment horizontally. I see no reason to change the defaults, which would only confuse existing users.
So, will there be a custom shortcut key function in the future?
Your screenshot shows the order of use:
Select two anchor points
Right-click on the selected anchor points
Press [B]
Press [R] to complete the right alignment
Since 2016, someone has proposed adding a shortcut key for the alignment function, just like in CorelDRAW, select two anchor points and press [R] to quickly align to the right.