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If you already have the name, Type.forName can do this. Also, you can use the new(ish) switch statement for better legibility:
String jSONSObject = '{}';
String sObjectApiName = 'Account';
Map<String, Object> fieldMap = (Map<String, Object>)JSON.deserializeUntyped(jSONSObject);
SObject newSobject = (sObject)Type.forName('Schema',sObjectApiName)....
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Custom Metadata Types support various relationships. They can have multiple records created against them which would allow you to manage individual mappings. They even allow you to have effectively parent/child relationships. Combining this with Entity Definition and Field Definition type fields would allow you to create the sort of configuration you've ...
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