Hi Gap. Thanks for considering our plugin suite.
Our Event Tickets Plus (ET+) add-on for Event Tickets (ET) can sell tickets via WooCommerce. Although it does create a WooCommerce product for each ticket and uses WooCommerce’s checkout screen/process (to collect the funds), it doesn’t actually use your WooCommerce store interface.
There is no import feature from existing WooCommerce products, but ET and ET+ could be used on custom post types, including Events created by our The Events Calendar plugin.
Last but not least, we have a pretty great Refund Policy so you can buy one or many of our add-ons and thoroughly test them.
Let me know if you have any follow-up questions.