So I have found a QCA9565 for 9€ locally (single band 2.4GHz, no Bluetooth, perfect. The other solution was a RTL8822BE, dual band + wifi. Should draw more power for nothing usefull in my case)
I hope that will not happen to me:
Don't wan't to recompile each time I need to update my router only for the wlan card.
I will know that in few days
EDIT: M.2 QCA9565 (QCNFA335) received today ... works fine with kmod-ath9k, no problem. Thanks everyone