DB - the reasoning for CDFA for FW is that there are less trim and attitude changes required compared to having to level off at MDA/H and then reconfigure for landing if you get visual.
Being able to come in at MDA/H in a helicopter is often the difference between getting in and not since a small gap in the cloudbase can give you the required references to convert to visual approach and land.
For exactly the same reasons, SAR approaches do not need to be CDFA, although the transdown to 200' or whatever is selected is, in essence, exactly that.
If you get visual before 200' you have the option of converting to visual flight, if you don't, you can continue in at 200' until you get visual with the target/coast whatever you are letting down to.
200' gives a good compromise between getting visual beneath the cloud and keeping clear of most obstacles (buoys, small rocks small vessels etc) and gives a good radar picture as well. In addition, you have at least some height to play with in the event of a malfunction.
Try to understand that your offshore procedures do not give the operational flexibility required for SAR.