You will be surprised what a large light source up close will do. I shot some tests last night with the model sitting on a bench right next to the wall. Light was from a single 5ft umbrella to her left. You can barely see a shadow on the wall.
Also shadows are not completely evil but they have to be controlled. I think the bigger issue here is not that you have a shadow but that you have multiple going different directions. You would be better served using one light. only and letting the wall reflect and provide fill. Or better yet put a black sheet on that wall and have one light with depth and intentional shadows on the far side.
I shot this last night. 1 light with a 30 degree grid camera left and about 3 feet away from her. A reflector just out of frame right. I have a shadow a hard shadow but only one and it makes sense based on where the light is coming from. I'm not claiming it is without flaws but just an example that you can do stuff in a small space. The area I am working in is only 12 feet wide. I do have a bit more length but could have done this shot in a 10x12 if necessary