"Most engineers and programmers will prefer the C syntax, which will look more familiar to them, so I've used it for all my published algorithms."
I'm not sure that's true. While I learned Pascal before C, I have many more years of experience writing programs in C-like languages (e.g., C, C++, Java, C#), and I still prefer the P syntax to the C syntax. I've always found the placement of braces of PlusCal examples in the C syntax to be very strange-looking to my eyes.
In addition, many programmers today have experience with languages such as Python and Ruby which are (arguably) more like the P syntax than the C syntax.