KafkaConsumer generic types for avro SpecificRecord using Reflection

I want to initialize KafkaConsumer generic types using classes loaded with reflection. The classes will be generated via avro-tools and will be extending SpecificRecordBase class. I know, I can use wildcards and do something like -

KafkaConsumer<? extends SpecificRecordBase, ? extends SpecificRecordBase> consumer = new KafkaConsumer<>(properties);

However, I am looking for something like -

Class keyClass = Class.forName("com.test.KeyClass");
Class valueClass = Class.forName("com.test.ValueClass");
KafkaConsumer<keyClass, valueClass> consumer = new KafkaConsumer<>(properties);

Any pointers would be appreciated. Thanks.