Build Freedsp Infinitas

Im studying freedsp Infinitas and I have doubts.
I checked this link

Subject of doubts 1- Infinitas board

Could Infinitas board be builded over an MCU board like XK-EVK-XE216 ? Can I replace with an Arduino compatible board? What is the cheapest MCU for that?

Subject of doubts 2- Analog IO

Is there any MCU board that could be able to build the analog IO expansion boards? Are there any Arduino compatible ones?What is the cheapest MCU for that?