How to Arrange Those Courses and Journeys?

Hello,

I have a puzzling requirement that I can't wrap my head around, so any advice would be very welcome. I have 2 courses. Each of them consists of an Initial course, and then a recurrent course that then repeats every two years. They have different content (slightly), and Initial and Recurrent need to be recorded separately. How can I make it in such a way that learners complete Initial Course 1, then Initial Course 2, and then they both have recurrency? 

My problem is to make sure they don't take Initial course 2 before Course 1. 

Here is a graph I made to brainstorm. 

But if I make it into three different Journeys, and a learner is enrolled into all three, they will still see Course 2 on their page even if I schedule Step 1 and Step 2 in a different Journey. Is there any way to make “secret” Journeys?