Fastest way for a scuff and squirt paint job

So my brother has a pt cruiser. He wants to paint it flat black because he saw how my 68 dart came out. Now my 68 dart was blocked and primed more times than I can count and really spent some time trying to get that thing right. Having to completely sand down paint jobs until I started getting good results.

Now there's nothing wrong with my brothers car paint and body, just wants a color change. I'm wondering what the fastest way to go about a scuff and squirt. This is kinda just his commuter car until we restore his cuda and then this car is probably gonna be sold for cheap.

Any idea? Maybe DA sander with 1000 grit? I don't really want to block the car with 220-320 unless that's the only way.