I believe it would involve two steps, data cloning and metadata override. Before we go further, let me remind you that it would cause double license usage for the file.
Assuming you've a data input (inputs.conf) setup to monitor the file with assigned index=indexA and sourcetype=sourcetypeA.
Step 1: Data cloning
You could configure your forwarder to clone the same data to two different indexers. See below link on corresponding outputs.conf configuration
http://docs.splunk.com/Documentation/Forwarder/6.5.0/Forwarder/Configureforwardingwithoutputs.conf#Configure_data_cloning_on_a_universal_forwarder_with_outputs.conf
Step 2: Metadata override
On Indexer two have following props.conf and transforms.conf
props.conf
[sourcetypeA]
...other linebreaking/timestamp recognition settings..
TRANSFORMS-override = changeindex,changesourcetype
transforms.conf
[changesourcetype]
FORMAT = sourcetype::sourcetypeB
DEST_KEY = MetaData:Sourcetype
REGEX = .
[changeindex]
DEST_KEY =_MetaData:Index
REGEX = .
FORMAT = indexB
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