Just by adding these, your cherry blossom viewing bento will be that much more spring-like. Since you don't use mochi rice, the fat of the meat will coat it in a nice round shape.
While thinking, "Can I make this without mochi rice?" I made this. We rarely use mochi rice in our house.
When steaming, the goal is to steam until the rice is heated. The steamer will get sticky, so try not to let too much of the rice touch the bottom of the steamer.
Enjoy Japanese food around the world.