I figured out there are very cheap hardware for RISC-V development, what if we port the deviation to RISC-V platform with more juice from the processor?
The Maxi Dock maybe a good choice
wiki.sipeed.com/en/maix/board/dock.html
It has lots of GPIO and cost under 20 USD and runs in 400MHz (or 600MHz overclocked) with 64-bits architecture and dual cores.