good idea,i will test that ASAPActually, If I recall correctly, Damage beams from a docked entity will collide with the geometry of whatever they're docked to, while it's built-in weaponry won't.
So, use a small damage beam "docked" to a rotated platform to aim at the convergence point.
the convergence point is a single block of forcefield (any color, but must be part of the main weapon entity) that only toggles on just before the converging beams fire.
Should work.
I've got no insight to the various Supply beams, so I can't help there.