I'm afraid not. I'm not 100 % sure, but to enter the wall successfully through a pillar I think there should be a 90 degree angle and some special kind of wall, like here
http://img299.imageshack.us/my.php?image=mariopillaronezo2.jpg where Mario can run around a little inside the wall.
This wall doesn't work as well as the previous, Mario doesn't enter all the way and can't run around inside the wall,
http://img204.imageshack.us/my.php?image=mariopillartwosc4.jpg
And in the room your asking about I couldn't even get inside Mips (because there is no 90 degree angle???) in the pillars next to Bowser's door. I tried with the other pillars and I didn't get closer than this,
http://img68.imageshack.us/my.php?image=mariopillarthreeis6.jpg
But I didn't use any tools doing this, so maybe it could be done if you jump in some special way or something.