To follow this up, I discovered some of the links there no longer work. I'll try to fix that, and in the meantime I found a Youtube channel with instructions on making wagashi that delightfully doubles as ASMR material. Here are some potentially useful ones:

• kuri kinton
  
• nerikiri which can be formed into chrysanthemum, sakura, wisteria, botan
  
• nama yatsuhashi
  
• uchimono
  
• kizatou
  
• minazuki
  
• kohakuto
  
• yuzu mochi