Ninja trader gets data from IB, and is free.
Should be able to interface Ninja from MT4.
Not sure how to do it, they document Tradestation- but perhaps similar to this method.
Interaction between MetaTrader 4 and Matlab via CSV Files - MQL4 Articles


Only real issue is (probably only) that the signals are coming off data that is not IB. Very messy, you take a trade off off a spike and you are not filled because market is nowhere near that.




Dont give up on an IB feed.
Since there is some architecture -> "remotedataserver at broker" ->"localdataserverproxy" ->"MT4internaldatacollectionenginethatservicesth e chart" , it should be possible to configure to use the "localdataserverproxy" (see MT4 additional installs available), and listen to data coming into that to find which port and what format and what to and fro messages are sent.

Or listen to the traffic between the "localdataserverproxy" and "MT4internaldatacollectionenginethatservicesth e chart" .