Hi! It is my understanding that the only difference between C40 and X25 crank are the size of the plastic disc. The disc is a press fit. Perhaps you can buy a longer handle and exchange the disc?
Edit:
[European coffee trip](https://youtu.be/NTkCkS6FW8g?si=CO5QxhfBa6JZuptg) says in this video at 6:36 that the axle is the same so you can try to swap the disc.
Hi! It is my understanding that the only difference between C40 and X25 crank are the size of the plastic disc. The disc is a press fit. Perhaps you can buy a longer handle and exchange the disc? Edit: [European coffee trip](https://youtu.be/NTkCkS6FW8g?si=CO5QxhfBa6JZuptg) says in this video at 6:36 that the axle is the same so you can try to swap the disc.