How would I join two gradients together in shader graph?

In shader graph currently have two nice gradients - created using the Lerp node - and would like to join them together to make something akin to the actual gradient node. I can't use the gradient node as that doesn't allow enough control in scripts or the inspector.

The end goal of this is to make a beam-in style shader for a logo. The first gradient will go from white to some HDR colour then the second from the same HDR colour to transparent so that when I move this across my texture one side will be transparent, the centre of this zone will be a bright glowy colour and the other side the regular texture. I've made the effect using the gradient node but I'm not going to be popular if I leave this in a state in which it's only editable through the shader graph.

I've got a feeling that the solution will involve UVs and tiling but can't figure out much beyond that! Thanks in advance for your help