Dual boot from Rock Pi 4

Dual boot is possible through a boot manager in Rock Pi 4.
In other words, having Android installed in the EMMC memory and Debian in the micro-SD and selecting the boot through the bootloader.
Another question…
The EMMC memory is compatible if I place the large heatsink it seems in the photo that may trip.
Thank you

In other words, having Android installed in the EMMC memory and Debian in the micro-SD and selecting the boot through the bootloader.

Currently not support. If you have bootable uSD card inserted, it will boot from uSD card.

The EMMC memory is compatible if I place the large heatsink it seems in the photo that may trip.

No. the eMMC can not be removed if you attach the heatsink.