One way might be to check their maximum checked luggage dimensions and get a non-standard-sized box that would fit the bat (but still within the size limit). Pack the bat well so that it does not get damaged during handling. You could write "FRAGILE" in bold red, but the handlers might still through the box around as they normally do.
Check the box and say a prayer...maybe you'll receive it intact.
প্রথম বাংলাদেশ আমার শেষ বাংলাদেশ, জীবন বাংলাদেশ আমার মরন বাংলাদেশ।