I 100% agree. We have an obligation to learn from the current failings of the US system – that is also what I think the FAEF toolkit points to.
Perhaps more on topic of the Article IV, we should not copy the 25th amendment to the US constitution verbatim.
It seems to me that even if we want to copy the rules of presidential succession they could be written a little more elegantly and less verbose, so ordinary people can read the article and draw a simple flowchart for what happens when the President dies or is incapable of fulfilling the duties.