Hello,
Thanks for reaching out! I am not aware of one specific hook/filter that you could use for this, but you can take a look at how the default button is generated in the wp-content/plugins/event-tickets/src/Tribe/Attendees_Table.php file.
Customizations like this are outside the scope of support that we are able to provide here in the forums, but if you would like to have the code done for you, we do have a list of recommended developers that you could contact.
Please let me know if you have any other questions!
Thanks,
Jennifer