Hey I know it's not something you've done before, but XPlane has some really incredible payware aircraft, mostly notably for me, the IXEG 737 Classic, however I don't enjoy flying single pilot in jet airliners, and FS2Crew was a massive part of what made me enjoy the PMDG 737 on P3D, Have you considered looking into developing your software for XPlane, especially given the rumours of a supposed 737 NGX port from PMDG. I just wondered because the 737 Classic surely would run very similar systems to the NGX and as such alot of voice clips could be reused.
Also for any of those XP pilots out there who would like to see this happen, please post, a developer is more likely to help us and create us stuff if he sees enough people would purchase it to make it worth his time investment.