Okay so my initial testing I think I have this working now. What I am doing is keeping the same config I have above where I am sending this to both environments. Then using the _TCP_ROUTING I am routing the sourcetypes I don't want going into my old environment back to my new. I will continue to verify this is in fact working and mark this as the accepted answer once I am sure.
Here is what I currently have configured on my forwarder:
outputs.conf
[tcpout]
defaultGroup - prod, new
forwardedindex.filter.disable = true
[tcpout:prod]
server = server1:9997,server2:9997
autoLB = true
[tcpout:new]
server = server3:9997,server4:9997
autoLB = true
props.conf
[sourcetype]
TRANSFORMS-route = route_to_new_env
transforms.conf
[route_to_new_env]
REGEX = .
DEST_KEY = _TCP_ROUTING
FORMAT = new
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