DIPFORTy2 - a version with external memory and usb and hdmi seems to possible also.
After doing 90 degrees turn the RAM routing looks doable, this is the most dense ZYNQ+DDR routing I have done so far:
This may not be so impressive, but LPDDR2 with 0.65 mm pitch is directly under Zynq BGA with 0.8 mm pitch, and HDMI signals have be routed through the memory routing area, all this on PCB with no HDI technology, no buried no blind vias.
It so often looks impossible until you just do it. LPDDR2 is directly below ZYNQ BGA, all signals routed in top bottom only, not internal signal layers used.