Can you pls redirect the second 20mm on BF 109 G10 in sync with the regular 20mm guns

Since i have the 3rd (additional weapons) guns set to middle mouse button it will conflict when getting in to an Fighter plane from ex Attacker. Cause i want to be able to fire them all at once and dont want to switch the 3rd gunner option button so the second 20s on the G-10 also fire with one click so to speak…

In other words it makes no sense having the secondary 20mm set as additional weapons when there is already other 2, being in an fighter that is