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Creating your own copy of the register.php file in your child theme is fine.
If you don’t want to touch the file, you could hook into either bp_before_account_details_field or bp_signup_username_errors to display a similar notice. Just create a new function in your theme’s functions.php that spits out your message and use the add_action function to hook into your chosen location.
See also: WordPress.org • bbPress.org • BuddyPress.org • Matt • Blog RSS