So we built this aacprocessors library. Intention was to read and manipulate any AAC software. Its not ideal but just made a new method just for the grid right now.

def replace_cell_with_xml(
    self,
    gridset_path: str,
    target_caption: Optional[str],
    target_action: Optional[str],
    new_content_xml: str,
    output_path: str,
) -> None:
    """Replace a cell's content with a new XML fragment across the gridset.

    Args:
        gridset_path (str): Path to the original gridset file.
        target_caption (Optional[str]): Caption of the button to replace.
        target_action (Optional[str]): Action command of the button to replace.
        new_content_xml (str): New XML content for the cell.
        output_path (str): Path to save the modified gridset.
    """

So search for a action or a cell label and it will replace all buttons tin the gridset with the xml of the button you replace it with.

For a demo see https://gist.github.com/willwade/26a1327c4e130b6afa36977fc129e09b

Really this needs more thought and a way of mking this across all AAC file types. I’m thinking a ‘replace_cell_with_raw’ method for sql or filebased systems. Its quite a bit different for sqlite systems though as they abstract the button logic from the content. Needs more thought