Well you can't really make a brush appear like how you intend. And if you transport people without modifying the efx files you'll get the green effect on top of any effect you make.
In the end the key is in efx files as they give you the kind of control that would make a Stargate type transport possible.
Btw the 3rd one you posted, I don't have any replacement transport effects in it (being my map

)