You will have to spend a little money but the easiest way would be to buy a second mounting bracket and transducer and install up front at your TM. Then you could move your DF back and forth as needed. It is possible you could find a used one on Ebay, long shot but only other way is to have 2 DFs.
If your DF is visible from the TM you can always swivel it so you can see it from the front, but that will give you a crick in your neck.
SeaRay