I have created many parsers in the past and I'm certain that such a simple language will be no trouble. My experience with MIPS is more limited, but it seems that advanced knowledge of MIPS should not be needed. I can certainly make the parser for you very quickly at least.
I have a degree in Computer Engineering from Carnegie Mellon. I had to implement a compiler for a class there and it's not so hard - just a glorified parser. I can do it if you pick me.