Buttercream Wilton roses in class?

I want to take the Wilton Method Courses. (cake decorating classes)

In the Wilton Method Course 2 (the version updated in 2010): I read that the Wilton rose was taught in Lesson 3 with Royal icing and there was a review of the Wilton rose in Lesson 4 with Buttercream.

But I heard that they updated the Wilton Courses again in 2014. I read that in this new Wilton Course 2- the Wilton roses are taught in royal icing in lesson 2. I feel disappointed because someone told me that there is no
review of the Wilton rose in buttercream like in the previous version of this course.

I really want to make Wilton roses out of buttercream icing.

I'm not going to take the Wilton Courses at Micheal's. I'm going to take the Wilton Courses at a culinary school. The tuition fee at this school covers all supplies & ingredients. That means I won't bring any ingredients from home- everything is available at the school. That's why the tuition fee at this school is higher than at a craft store like Micheal's.

I was thinking this: during my Wilton Course 1 class- I will ask the instructor,"I heard that the Wilton Course 2 students will be instructed to make Wilton roses out of royal icing. I prefer to make my Wilton roses out of buttercream icing. When I have my Wilton Course 2 class here- can I make half of my Wilton roses out of buttercream icing and half of my Wilton roses out of royal icing? For example- if the original lesson plan is to make 12 Wilton roses out of royal icing- can I make 6 roses out of buttercream icing & 6 roses out of royal icing?" What do you think the instructor will say if I ask this? Do you think he will allow this?