If you can find the title in GM9 from SYSNAND SD -> title/00040000/(your game)/content, you can select the TMD file and select TMD File Options -> Mount CXI/NDS to drive, and then just copy the rom from the folder romfs/rom. The name will be nonsensical but you can remane it after you copy it to something more usable.
This should then be a rom that could be run in emulators and such.