Alternate buttons

Hello kind people 🙂

I am working with Woocommerce and Woocommerce Memberships.
This site is a typical Membership site with live classes.

So if you buy a product you get access to specific sites, were you can join classes.

Now I have one site called “my courses”.

On that site there should be all the Products.
The ones the users have allready bought should have a button “join”.
The ones the users havent bought jet should have a button “buy now”.

I have tried is with a plugin that makes different things visible and invisible according to the user roles of the user and a second plugin (Members only from Woocommerce) that creats new userroles and gives people those userroles if they buy a product.

If I give those new userroles to somebody manually this works fine.
But automatically it doesnt work.
Also people cant have more than one userrole, wich makes all this even more complicated.

I have the feeling, that my way of doing it is far to complicated for a problem that is absolutely normal. A lot of shops have this.

So what is the easiest way of doing it?

Sorry for this long question.
Thanks in advance.

Cheers,
Nino

The page I need help with: [log in to see the link]