A printed graphic will always look a tad grainier than a "fresh" vector graphic on-screen.

What you won't easily obtain the the slight grainy transition between the stops, but likely can with filters. Or post export editing in a bitmap editor to add grain.

In any case, multiple stops along the gradient path works fine.

Click image for larger version. 

Name:	capture-002604.jpg 
Views:	265 
Size:	26.1 KB 
ID:	105783