What if you fused Gravel-pit and Steel into one game-mode? This would be it!
This prefab has 4 control-points with A, B and D being enabled from the start with the only locked point being C.
Cap times in the prefab
A - 8sec
B - 8sec
C - 6sec
D - 40sec
change these to your liking!
The reason C caps faster than both A and B is because the idea was for Blue to choose which buff from either point they want first and C would be an extra that adds something minor, but how you make the game-mode is up to you, this is just the prefab!
Crediting me for the prefab is not required but greatly appreciated if you do!