Can I make a suggestion?
Why not make a low fuel pressure buzzer/light product?
Most of us have or can easily set up the low oil pressure and overheating alarms, but almost no one has a low fuel pressure alarm that does not have the EWDS. I happen to have a fuel pressure gauge in the cockpit with a red light that comes on at 1 PSI or less, but most of the fleet either has nothing or a mechanical gauge near the engine, not cockpit readable.
You have the low fuel pressure switches still I presume. That and a light/buzzer and you are set