Photoshop :: Resize Multiple Images If Large Enough Using Actions?

I work at an architectural company and I need to resize a lot of images in our database. We’re talking about roughly 40.000 images, but that is not the hurdle.Previously I have made an action that resizes my images in two steps, because I need them in two different qualities When I open the image and runs the action, it does something like this:
 
Convert mode: Convert to RGBSave: As JPEG, quality 10, and in a certain folderImage size: width 800px, constrain proportionsSave: As JPEG, quality 8, and in another folderClose Now I want to make a change to that action, by resizing the image two times instead of one.I want it to look something like this:
 
Convert mode: Convert to RGBImage size: width 4000px, constrain proportions (BUT ONLY IF THE IMAGE SIZE IS LARGE ENOUGH, OTHERWISE LEAVE IT AS IT IS)Save: As JPEG, quality 10, and in a certain folderImage size: width 800px, constrain proportionsSave: As JPEG, quality 8, and in another folderClose

How can I do this? Do I need to add a variable or?