There seems to be a consensus among the Germans who built the Rafale that there just isn't enough space to install retracts that will hold up to prolonged use.
In the twin edf setup the space between the duct and the fuse bottom is only about 1cm
... That's why none of the Germans edf'ers fly it with LG.
On the other hand if you go with the single 120mm fan option, there's a lot more space and retracts seem feasible. Ducting for a single 120mm fan (WeMoTec 750 for ex) should be available from Aeronaut in the spring...