Sure. You just need to prevent switching sd channel with the controller. In DisplayList
#if FEATURE_CONTROLLER == CONTROLLER_RADDS
#undef SDSS
#define SDSS 10
#undef SPI_PIN
#define SPI_PIN 77
#undef SPI_CHAN
#define SPI_CHAN 0
delete the #undef for SPI there.
I think that is all needed to use the radds sd card reader instead.