The bigger problem is that Qualcomm and Mediatek are so far behind Apple that nobody else makes an ARM chip with M1-type performance and battery life
No and it's probably not possible to get M1 results out of anything remotely modular. The M1's success is largely due to vertical integration. You definitely can't get as good a laptop using a non-Apple ARM chip (see e.g. the Surface X).
I don't want to use an Apple laptop, but I do want a fanless design with M1-type performance and battery life. Can you do that with anything from Intel or AMD?