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The iKKO Mind One fills quite a few of your requirements, including headphone jack and SD card slot (through the optional keyboard case, which also includes a DAC), single camera that flips manually into a selfie camera, and comes with iKKO's alternative OS built-in (can also be removed prior to order) and will support bootloader unlocking to install third-party OS.
But it's a first-gen product not yet released, and fails several of your requirements. The battery is small (because it is a low power device with a very small screen), the company is based in China I believe or at least has strong connections there, and it's not a rugged phone. So maybe not ideal for you, but I thought I'd put it out there since not many people are aware of this phone yet and it is quite a niche device that is very appealing to some.
Otherwise, Sony are really the only mainstream manufacturer I'm aware of that still consistently has headphone jacks and SD card slots on their devices. Many others have one or the other, or are limited to both on cheap/low end devices. I'm not sure if Sony still allows bootloader unlocking, as their unlock tool only covers previous gen devices currently.
While that phone is probably the most interesting one I have seen so far, I doubt I would be happy with it.