Is there a way to use my headphone’s mic and speakers with just one 3.5mm jack?

You're out of luck on this one. Each jack has its specific purpose: one for sending audio to your headphones and the other for receiving audio through the mic. Unless you get headphones designed for a single 3.5mm connection, you're stuck without an adapter.

The simplest solution would be to get new headphones or earphones that only use a single 3.5mm jack for both mic and audio. It would save you the hassle of dealing with adapters.

There are options if you're open to using a cable adapter. There are plenty of simple and discreet cables that can combine the microphone and headphone outputs into one jack. You should barely notice it once it's connected. For instance, you can find something like this on Amazon: [KabelDirekt Pro Stereo Splitter](https://www.amazon.com/KabelDirekt-Pro-Stereo-Splitter-Headphones/dp/B00GN76HAG).

Unfortunately, you can't really connect both the mic and speakers without an adapter. Each 3.5mm jack serves a different function—one is for the microphone and the other for audio output. If you're feeling adventurous, you could theoretically splice the wires to create a combined 4-pole jack, but I wouldn't recommend it unless you know what you're doing. By the way, I'm curious about what you mean by "unethical" regarding the adapter?

Buying a specially designed adapter that combines the mic and headphone signals into a single TRRS plug would be ideal. Though, I totally get your point about not wanting an adapter! It might be worth considering to find a headset that fits your needs better.