I guess so, but I assume it's not worth it.

You can set this up once and save it all, then you just have to reload the HDRI 3 times.

But sometimes you want to make adjustments, so automatizing this is not much of an advantge.

For instance you may want to adjust the size and fading of the 2DWave shader mask, or you may want to switch the shadows and diffuse part off (you can do this by just using the same material on the ground as on the background of the GROUND object.)

Generally, you want the mask and "passive diffuse" part which catches the shadow to be as small as possible, to reduce noise in the rendering, but at the same time you want the transition between both materials to be as smooth as possible to reduce any ever so slight color and shading differences that night occur.

another thing worth mentioning that people often seem to miss is that your figure should not be at 0,0 but offset. 0,0 is actually where the image was taken from, so you actually want to place your camera around there.

At least thats what I think, I havnt played around with this too much.