Disable sanitize_file_name on upload without modifying functions.php

Can you try adding the following code to the functions.php file in your theme directory and see if works for you

function keep_raw_filename( $filename, $filename_raw )
{
    return $filename_raw;
}

add_filter( 'sanitize_file_name', 'keep_raw_filename', 10, 2 );

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