Need ideas/rules for a post-apocalypse challenge

Your sim/family are the only ones left after nanomachines/aliens/the rapture/the mother/[insert deadly thing here] occurred and everyone else disappeared without a trace. There's no damage anywhere, but everywhere is... empty. Can your sims find what they need to survive?

ideas ive used so far:

• MCCC to delete all sims and restrict any spawning sims to YA age only, and Zulf's No Random Generated Townies to stop even those from spawning

• Off the grid lot trait - there's no one left to maintain the power grid or water supply, so you have to generate your own. Eco Living helps. You can have any electronics you want, assuming you can power them.

• Simple living lot trait - there's no one left to maintain food supply. You can make a greenhouse but you have to find your own plants in the world. You can steal other ingredients and farm animals from the general store in Chestnut Ridge but you still leave payment because you're an honest sim.

ideas for optional things:

• babies must be breastfed or given solid food (no supply chain = no formula. (or maybe you stocked up on formula?)
• no selling. there's no one left to sell stuff to.
• there may be mods that allow you to build your own furniture
• the royals of Ondarion survived the disaster and are not opposed to taking other lands. You need to make your own dynasty and become royalty yourself so they don't take your land.
• mods to stop sims from eating things like bread and cheese which are better used for cooking other things
• no internet. offline things like video games and writing books are fine. you could also have a day or two at the start of the run where power/water/internet is still on because those things wouldn't stop right away if everyone disappeared irl

Any other ideas?