ラックス、炭シャンプーなど大浴場にはシャンプーバーがありました。部屋はペリカン石鹸のトリプルCという商品でした。

I don't believe you will be able to find breast pump accessory within walking distance of the hotel or Akashiyama. Even the convenient store next door sells only food and daily essentials only. If in Kyoto, you should be able to find the parts you need in any department stores's baby department. I was also breast feeding when we travelled with our little one who was less than two at the time. One thing we found is Japan is so baby and mother friendly that you can find nursing room available in any major pubic areas. Hope this helps.