I see plenty of "glove box"-type lab equipment which has an airtight enclosure (often rated to some degree of vacuum), and gloves which allow handling of things inside. Surely it wouldn't be too hard to DIY such an enclosure, but pressurise it to 1 ATM instead? E.g. a small air compressor and a relief valve set to ~15psi or so?

I am thinking that you would put a kettle of water inside, pressurise the container, and then boil the kettle (would need a power or gas line installed) and make the coffee using the handling gloves. Then depressurise the container and retrieve the beverage.

I'm no engineer so I would be interested to know if this would set me down a path of "you'll accidentally maim yourself", but I wouldn't think you'd need anything fancy or hazardous in terms of materials or engineering, given most human-made structures exist at 1atm.

Would probably need to be careful to let the coffee sit for a few minutes to avoid flash-boiling it though, unless you're adding cold milk.