I've got a few thousand hours on 737 CL and I can hosnestly say I learning the FMC and EFIS bits was not a challenge. Ground school, Aerosim and fixed base should be enough to master those. What really helps is handling the aircraft with confidence, not having to repeat OEI handling elements and keeping the CRM together when under pressure.
The 737-200 sim is half the cost of the pukka FM sim MCCs that I have seen. Any jet sim course hand flown will greatly enhance capacity, but why spend more on an MCC for sexy flat screen FMC niknaks that have no bearing on basic essentials?