ADC_DMA & HARDWARE_SPI_DMA

[MaurinElectroTextile]

Hello,
I'm using your ADC library with Teensy 4.0
It is working like a charm, thanks for sharing such good work ;-)
I'm already using your DUAL_ADCS technic in order to scan a 16x16 matrix of analog sensors.
But because I want to optimize the CPU consumption I'm wandering if I can implement your ADC_DMA ping-pong solution: ADC/examples/adc_dma/adc_dma.ino.
The tricky point is that I'm using shift registers so I need to send commands over the hardware SPI alternatively with the analog readings.
So my question is:
Could it be possible to use the DMA for ADC readings as well as the hardware SPI?
The code I'm doing so far :
https://github.com/eTextile/Synth/blob/master/Firmware/main/scan.cpp
Thanks a lot for your help