Per your pictures the expensive set up not only heats the water it keeps it moving. Notice the return line is hooked into the supply line(9) just above (3).
If you add just a heater it would not work because you need to circulate the heated water threw the pipes.
Addind only a circulator pump will work for a few degrees below freezing but the pump will have to run 24/7 as long as the temp is below about 28 degrees F.
The idea of adding a heater in the system allows for you to shut it down because hot water takes longer to freeze and the hot water will melt any ice that has started to form. The hotter the water heater is set the shorter the circulation run time.
With that said your set up should work. You need a small pump to move the water; and one of those instant water heaters like used under a sink. Plumb the return back into the supply and install a switch that turns the pump on when needed.
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