Is it possible to swim at the first attempt?

Is learning to swim the same as learning to ride a bike? No!

You can't ride a bike if you haven't learned to balance yourself.
Swimming doesn't need balance, you could theoretically swim at the first attempt, if you would imitate the right movements.

Learning to swim means to subconsciously do it without thinking about it.

I think you could swim, but in a more simple way, because the way you learn to swim is not the way a drowning person would try to swim.

It should be possible to invent a technique that helps people, to atleast stay alive for awhile.

My idea is to imitate swimming movements. To achieve that you need to know how to move and the timing.

The best way is a song! Yes, a song. A catchy song that has easy and repetitive lyrics that are easy to remember and the beat takes care of the timing. The lyrics are the manual to swim

Something like: Jump like a frog... ...push your flat hands down

Let's call it "dictated swimming "

Anyway, this is just a suggestion, the bottom line is, it is possible to swim at the first attempt.