Wordpress, Mailchimp, Campaigns - should separate campaigns be used for something like notifying users of drip content?

I am new to integrating Wordpress and Mailchimp. I have a Wordpress site that offers music courses.

Within a course are several lessons.

I drip the lessons weekly, so that each lesson starts on a Monday.

I just added Mailchimp support via my site's composer.json by adding

  require: {
    mailchimp/marketing: *
  }

I can now use the Mailchimp API via

   require_once ABSPATH.'/vendor/autoload.php';
   use MailchimpMarketing\ApiClient as MailChimp;
   $mailchimp = new Mailchimp();
   $mailchimp-setConfig([
            'apiKey' = MAILCHIMP_APIKEY,
            'server' = MAILCHIMP_SERVER_PREFIX
   ]);

So all is well so far...

Now I am having a hard time conceptualizing how I should use Mailchimp to send emails to users who are subscribed to a course.

I use Memberpress to handle the dripped content, using its Membership Rules feature.

And for a given Membrepress membership I automatically create Mailchimp Merge Tags of form

Course_123
Membership_Premium_321
Membership_Trial_322

Where the numbers are the course and membership ids.

Once created, I then update my post meta so that for memberships I know the corresponding Merge tag ID. So in principle I have some starting point from which to build, but I don't know if this is the right way.

Now, when I add a Membership Rule that is of sort _mepr_rules_type = 'single_lesson' I am ready to create the Mailchimp Campaign, since I know the lesson id, the start date of the lesson associated with the rule, the associated memberships the rule access deals with, and I know the course id. With all this info I can create the content of an email.

But here is where I am stuck. Here are some questions:

1. At this point, should I create a separate campaign for each lesson/course pair? So campaigns like Send Email When Course 1, Lesson 1 Opens, Send Email When Course 1, Lesson 2 Opens, etc. In this case, the email distro would be segmented based on a condition like

user has merge tags Course_123 and Membership_321

and then using the MailChimp API I can generate a template on the fly with content for a given Course/Lesson being opened.

2. Or would it be better to create one template, and one campaign, and dynamically manipulate them via the API, using my own short codes? So, a generic campaign Send email when some lesson becomes open, and a generic template of sort

divLesson [title] has just opened and is available at [url]/div

With option 2, I suppose there is danger of multiple lessons across multiple courses opening at same time in which case maybe this is a dealbreaker since a change to a campaign/template might mess up another course/lessons's sent email content, but at same time my gut tells me option 1 is a bit overkill if I am creating separate campaigns, templates for every single course/lesson pair.

Anyway, figure many people have already figured this sort of stuff out and really curious if there is some tried and true approach that you could recommend.

Thanks!