Arduino Due as Triggered DMA SPI Slave is possible?
I think I have discovered a solution while searching:
https://github.com/avrxml/asf/blob/master/sam/drivers/spi/spi_dmac_slave_example/spi_dmac_slave_example.c

It is an example for atmel's sam3X8EK. But the MCU cores are same. Though the code serves different purpose, we can manage to mold it in the direction we need. 
Only thing remained to do is to push an array through it.
Fellows, what do you think?