Probabily one of the best mental wanking I have see in recent past. Question is stupid and many of the answers are out of topic. The rule 17 only talks and limit the sailing above proper course, below is fine. Any below. Rule 18 doesn't applies as none of the boat is in the zone so rule 18.4 it's not existing. 
Any topics about "where to gybe" is out of matter becaus "in absence of other boats" is still referring to a boat that "is sailing above proper course" and not below. Same about "promptly passing astern".
In the situation posted there is no penalty for anyone.
In my life, on top of around 3000 protests I've been involved, I only had 4 or 5 protests involving rule 17. Welcome match race!

There are a number of circumstances where one may have time to squeeze in an extra race. Change in the weather making races run much faster than expected, big wind shift turning the course into a procession so its rational to shorten a race early are examples. 

To my mind something like "the first race will not start before 10am, no race will start after 4pm. Races will have a target duration of 40 minutes. As many races as possble will be run." may be an appropriate 'schedule' for some events in some circumstances. 

It comes over loud and clear that a majority here do not expect or want unscheduled races, and therefore if one wants that flexibility it should be made clear in NOR/SIs.   It may be those of us who have sailed in massively  unpredictable conditions are more likely to be in favour of getting in races whenever possible.

There were a couple of interesting questions raised above.  
1) If you were to provide advice with AI what would you train it with.   
I would train it first with the rule book, then I would give it the World Sailing Casebook, then I would give it any national authority Appeal books available online (RYA, US Sailing, Sail Canada).  I would probably add written decisions from major regattas with experienced trusted juries (Olympics, Olympic Class World Championships).  If I were training it to write decisions I would give it the Standard Wording document.  I would consider what other resources were available online and use them as well.  One of the reasons that we are behind on this is that not many articles are available online for AI to digest.  In other fields there is a lot more published.  I would consider some of the Sailing World rules articles, some of the articles on the rules in Dave Dellenbaugh's newsletter.  If I were doing it myself I would add my own articles (https://rcyc.ca/Sailing/Racing/Know_Your_Rules)
2) What have you used it for
I have done a quick experiment with this.  I don't know remember whether it was Claude or CoPilot.  I gave it the RRS and the standard wording.  I then gave it the facts founds by a fairly experienced protest committee and asked AI to write the conclusions.  Some parts were correct and in fact did better than the original protest committee.  Some parts need correction.  
I have used AI to help me review NoR and SIs.  For example I have asked "For major regatta's for xyz class do they modify such and such in the NoR"  I have been returned NoRs with and without the modification.  This can be very helpful.
I did try to use it to generate a pairing list for match racing.  It didn't do well at all.  

Rule 89.2 provides the option to change the NoR provided adequate notice is given.

As brought out by John d Farris, any change needs to be communicated to all stakeholders.

I was responding to your question about QR codes.