Not sure if it is a simple issue to resolve or takes more complex development.
But, we can only support the features as shipped and that is not one of them unfortunately.
Modern Tribe does not do custom development, but we have this list of people that might be able to help:
https://theeventscalendar.com/knowledgebase/find-a-customizer/
One idea I had that might work is to force the ticket form to always use the main language of the site:
global $sitepress;
//changes to the default language
$sitepress->switch_lang( $sitepress->get_default_language() );
//ticket form coding
$sitepress->switch_lang( ICL_LANGUAGE_CODE );
The ticket form is found here:
event-tickets-plus/src/views/wootickets/tickets.php
And can be moved to your theme here to edit:
yourtheme/tribe-events/wootickets/tickets.php
That might enable you to at least use tickets at least. And only create them in the event under the default language.