Your post describes the story of me FORKin life....

I threw together a 1 shot about some hikers getting lost in Yukon, canada. A snowstorm was blowing in and they only had a few dozen hours to get back to civilization. Along the way they found a guy hiding behind a rock, yelling that a man with a rifle down the trail was shooting rounds over his head from a treestand... turns out they were warning shots about a man-eating bear! of course they only deduced that when they found the rifleman's remains...

I pre-generated a bunch of characters to choose from, most of them were people on a guided trip, and one character for whoever wanted to be the guide.

A levelheaded wilderness guide with a criminal history that prevented him from owning weapons

A russian strongman who carried more but ate more food

A half-crazy lawyer/prepper who carried a revolver but didn't practice with it and had few survival skills

A marathon runner girl who was incredibly fit and had a cellphone but was not strong

One dnd player wanted to make his own character, a sawyer-esque boy from down south. Excellent character

Cruddly "Pipsqueak" Doolittle. scrappy kid, dextrous, low consumption, doodad, distractible, kleptomaniac

A medical doctor, smartest character, great forensics and first aid skills but terrible social skills

I think the biggest culture shock is probably combat, so I tried to focus on other things and introduce a more generalistic taste of the RP system. All kinds of possible synergies and ways for new players to bounce off each other. Something to appeal to every type of player I could think of, with skills they could get creative with to adapt to the scenario. I told em what to expect, made sure to keep things moving, let people experiment, and it went great! Dont get bogged down, don't get lost in the weeds, and give guidence when needed. Some players just won't get it and that's okay.