Endnow: Are you suggesting something like iagA W! 11_77 SCH k SBH B iagA W! 11_77...?
You can, at least in theory, chain the first part of combo into itself again. However there are two issues:
1. SBH B shifts your angle to the wall. If you watch carefully, it actually rotates you to a position that is less perpendicular and more parallel with the wall. At some point, even if you chain the combo back into itself, this means that you are going to be at the wrong angle for iagA W! to occur. Instead the iagA will just throw them away from the wall.
2. SBH B iagA W! wall splats them fairly far from Siegfried, and depending on a range of factors, 11_77 will miss or the SBH B will be off axis and whiff preventing you from chaining the combo together.
Still, it's definitely worth a try, especially if you're on a smaller stage like the cage stage, where it's easier to get someone into a corner. If nothing else, do it for the style points.