Start Theme from Bootstrap Website / Vite - Laravel 9

So I'm generally a backend developer, but I can get away with most things on frontend. Recently I needed to work on a project and to make my life easier I went with the Start theme you created for Bootstrap 5. Unfortunately, integrating it into the Laravel 9/Vue/Vite stack is a general pain because none of the core files are written as ES6 so I can't use import statements (they all use require/webpack).

Is there any kind of an upgrade guide so I can get this running? Obviously integrating the Sass part was no problem but the JS has stopped me from development and I might need to use a different theme if I cannot get this to work right.