native(805) final simulated static function GetMapList( out array<MapRecord> MapRecords, optional string Acronym );
This function creates array of avaible maps depending on MapPrefix (Acronym here). It's used in MaplistManager, check out how it's made there and then make your subclass. There is a function GenerateGroupMaplist(), which actually creates list of maps, so call GetMapList() there few times with your MapPrefixes - Then link your CustomMapManager to MaplistHandlerClass property of your game type.
Never tried that, but should work

Helped?
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