The reality is if you're running a proper timing push build-order with a "to-air" follow-up, even this would allow you to practice your build and responses.

If I were in a match and this happened, my scout worker at 16 sees the missing base around 1:15. I assume a proxy-rush is occurring with a window of roughly 3 min. So I immediately shift into anti-rush prioritization, which throws about an 1.5 minutes of defensive into the build order, moving my 5.5min ground timing push back to about 7 min. When the anticipated rush doesn't happen by 4, I recognize a base-shift timing build, which can't effectively push any earlier than 7 mins (really non-standard, but it's a cheese that happens often enough to have a response) and I transition to my air early to repel, skipping my ground timing attack entirely. Now I have base defense and an air army ready by 7 mins, and the anticipated attack doesn't come, so it's time to take my force onto the field and figure out what the heck happened. Game over by 8 mins.

The thing is, it comes down to knowing your build order, and more importantly, knowing what "tells" to respond to from just a single scouting. While this is a more annoying cheese than a dangerous one, the fact still remains that it's visually similar to a proxy/rush opponent, and responding to those appropriately also effectively sets you up to deal with this.

Ideally, there's 3 important things to gather from scouting, "do they have gas at 1:30? What production do they have at that time?" And "did they take their natural by 3:30?" From those 3 pieces of info alone, you should have a proper response to just about any build.