SA2B Gamecube Modding - Remove fallen pillars from Hero Garden or prevent Chao getting stuck?

Long time no see, I totally forgot I had an account here after my mom died...

I saw that the Steam Version has some neat mods, like Chao never getting stuck in the Hero Garden's pillars. Unfortunately, I dunno how to port this to the Gamecube version (create/edit a file from the ISO, maybe?) However, it may be possible to do something similar with SA Tools, as there is an option for GC Hacking in the software. I wanted to know how can I remove the fallen pillars in the Hero Garden, but they don't seem to appear in the Model Preview of SA Tools... kinda annoying, since Chao get stuck forever until you move them elsewhere... Here is the OBJ list of things in the Hero Garden:

Arg2=2
Flags=0
Code=0C900DFC
Name=HASIRA

[1]
Arg1=2
Arg2=2
Flags=0
Code=0C900E7C
Name=HASIRAKAKE

[2]
Arg1=2
Arg2=2
Flags=0
Code=0C900EFC
Name=HANAAKA

[3]
Arg1=2
Arg2=2
Flags=0
Code=0C900F48
Name=HANAMURA

[4]
Arg1=2
Arg2=2
Flags=0
Code=0C900F94
Name=KUSA A

[5]
Arg1=2
Arg2=2
Flags=0
Code=0C900FE0
Name=KUSA B

[6]
Arg1=2
Arg2=2
Flags=1
Distance=250000
Code=0C90102C
Name=KUSA C

[7]
Arg1=2
Arg2=2
Flags=0
Code=0C901078
Name=TOWER

[8]
Arg1=2
Arg2=2
Flags=0
Code=00000000
Name=C_SPHERE

[9]
Arg1=2
Arg2=2
Flags=0
Code=00000000
Name=C_CYL

[10]
Arg1=2
Arg2=2
Flags=0
Code=00000000
Name=C_CUBE

[11]
Arg1=2
Arg2=2
Flags=0
Code=00000000
Name=WALL_PLANE

[12]
Arg1=2
Arg2=2
Flags=0
Code=00000000
Name=LOBBY

[13]
Arg1=2
Arg2=2
Flags=0
Code=00000000
Name=C_CLIMB

Just wondering if what I want to do is possible via SA Tools. Thank you very much. I will patiently wait for an answer. And sorry if it ain't the right place to ask...

Dave Freeman