I briefly glanced at the documentation (that you linked in your most recent post) and noticed at the top of the "Related Pages" tab:
It sounds like the SPI pins on your A-Star 32U4 can be connected to the NRF24L01 module without having to modify the RF24 library. You can find all of the hardware SPI pins on the A-Star's ISP header and look at the pinout and components section for your A-Star version in its user's guide as reference.
Also please note, that the SPI pins on the A-Star do not correspond to the same SPI pins on the Arduino Uno. The A-Star uses the ATmega32U4, which is similar to the Arduino Leonardo; not the Arduino Uno. You do not have to change connections for the chip-enable (CE) and chip-select (CS) pins, but you will need to connect SCK, MOSI, and MISO to the correct SPI pins (pins 15, 16, and 14, respectively) on the A-Star.