Global,
I think its probably safe (as long as the SOP's are sorted), but a bad idea. The 200 and 800 should be flown as two diff types, because they are two diff types. I don't see the -400 boys operationg the Classic!?? They're both Jumbos. If your company wants a common fleet, get rid of the old 200's. They've more than overstayed their welcome and I'm sure the other two small 737 operators in SA could do with the hardware.
Operating the 800 with the 200 type displays is like buying a Ferrari and sticking Toyota badges all over.
By the way, since you don't email me any more, congrats are in order I believe.....