SRAM in a custom board

Are you exactly sure it's the same interface and timing? If it was it would work.

Since you said you're unfamilar with fpga design I would say try the custom interface if possible (it's a really easy bus to use for connecting generic hardware to).

But if you want to be able to design this fast it may not be the way to go (I'm sure you would need some hardware external to the SOPC to do some conversion between that bus standard and the memory.

G-luck