The OP doesn't mention it but, since Goro got his movement speed increased, he can now switch sides at the end of this combo simply by substituting Tap Walks with Run Cancels: b12u2, tap walk, b12u2, tap walk, b12u2, b12 xx dbf3 - 34%
You can also accomplish the side switch using other normals at the end but B12 is fairly easy (Down+4 is more reliable IMO). Before the move speed buff he had to sacrifice a fair bit of damage or spend a bar to perform a sides switch during a B1 combo.
It`s worth noting that you only have to run at the second tap walk to switch sides, although using two run cancels will also work.