Is it possible to have a user who is subscribed to three or more separate subscriptions be "upgraded" to a larger single subscription?

iOS subscription implementation and App Store Connect question here.

Let's say I have 30 different subscription options at $1/each:

  • Movies
  • Books
  • Video Games
  • Music
  • etc.

I want to have a subscription to unlock each one. A user can have anywhere between 1-30 of these subscriptions. But I also want to offer "Unlock All" subscription, which will upgrade from all currently subscribed subscriptions into this one overarching subscription at a discounted rate of $15 (half price of a possible $30 total if they had them all separately).

From what I've read, I can only have tier upgrade/downgrade subscription options inside a "Subscription Group" in App Store Connect, and a user can only be subscribed to any one single option at a time.

There's no option to go from 3 lower tiers -> 1 upper tier currently, is there?

Is it possible to have a user who is subscribed to three or more separate subscriptions be "upgraded" to a larger single subscription?
 
 
Q