±3 V 80 kHz Line Driver

I have a Teensy 4.1 producing a 0–3.3 V, 80 kHz square wave that must be pushed onto a power line as a clean ±3 V logic-level signal. The link sits inside an industrial-automation cabinet that is notoriously... (Budget: €8 - €30 EUR, Jobs: Analog Electronics, Electrical Engineering, Electronics, Embedded Systems, Engineering, Matlab and Mathematica, Signal Processing)