Couldn't the developers also reintroduce the old Crimea theater with some slight upgrades? It would take some work but it was a great place to fly around. I remember flying there in the original SSI Flanker in 1995 all the way up to Lockon.
Maybe the airfields would need a bit of a makeover but it should be manageable in an acceptable timeframe. I know it would be Russians/Ukrainians again but it would be a quick and easy map (I guess?).