Your low gate capacitance fets idea (driving the bigger output fet), could we worth trying. Are so powerful, you don't even need the output fet, unless the currents are somewhat big, or it needs to dissipate power. But some fet drivers I bought a significant stock of a while ago. I prefer to take the quick/lazy/easy option of using standard fet drivers or fets with built in drivers (expensive, but ok for one offs). For one offs (with little prospect of manufacture), or early prototyping. The best ideas (low cost), seemed to be to use cheap, high speed logic gates, and parallel the outputs (not everyone likes doing that), to increase the output drive current capabilities, still further. Ironically I was looking into a similar problem, fairly recently. Hundreds of KHz, is a completely different matter, especially if you want high conversion efficiency and/or low device dissipation. 2 KHz is normally very easy with MCU port pins (unless very high currents or something are needed, even then you may still be ok). I did not realize you needed somewhat high frequencies.
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