I think the "Childhood friends tropes list" is just an excuse. A façade. Kaede herself says so: "I'm so glad I could be childhood friends with you." She is happy and comfortable with their current situation. Of course, she's fully aware that she has fallen in love with Kohuei and that her feelings are reciprocated by the boy, and she knows that this cannot go on forever. She probably just needs some time to adjust to their new situation. I think they'll start dating just before they go to high school.
I love this chapter. They both expressed their feelings and made it clear that their intention was to take a step forward and start dating.
Thank you for the translation!