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Could you have a parallel system that the house power switches to? Or even separate outlets to plug appliances into

Separate outlets means running cable that you won't use most of the time, and having to remember which outlets go to which circuit.

A transfer switch allows you to isolate and switch between two power supplies so that your house circuits are only ever connected to one of them, and the two supplies are never in the same circuit[1]. They can be had for a few hundred depending on the load[2].

[1] this is a break-before-make switch. There exist make-before-break switches for when you need uninterrupted power supply, but they're not appropriate for this case as you'd be backfeeding into the grid which is dangerous and illegal.

[2] https://www.lowes.com/pl/Generator-transfer-switch-kits-Gene...

Anyone can fortunately only make the backfeed mistake once, as whatever generator they backfeed will no longer exist after the connection is made.

There's no need for that. Turning off your main breaker in your panel will disconnect you from the grid and prevent backfeeding.

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