Most beginners age 12 and up quickly grasp kuchishoka. Grasping is step one; building fluency comes next. Along with the kuchishoka deck, I use Taiko Tiles to support that development. (Here’s the post on my kuchishoka deck and how to use it in the classroom.)
Both of these instructional aids are a huge help to visual learners. The western notation supports students familiar with that system and introduces it to kids who aren’t familiar with it. Having students arrange short patterns with the Tiles and post them on the board for everyone to play is a low-risk introduction to composition. If you’re following my preferred method for teaching new songs, the Taiko Tiles can be a Step 6 (posting them to reinforce what students just learned).
Here’s a pdf of a basic Tile set. I print them out on colored paper, putting note families on similar colors (don and doko on dark blue and light blue paper, for example) and have them laminated for durability. Masking tape works great for posting, and if you laminate them, they’ll last for several years. (Most print shops can laminate, if you don’t have access to a laminator.)
If you use this resource, let me know! I first worked with these in Tucson, and Kristin and I have fine-honed them in the last few years. I’d love to hear about any further adaptations people come up with. Happy teaching!