The one other example I know that morphs the language to that extent and to the detriment of readability by C programmers is the J interpreter[1,2]. But, once again, nobody (that I’ve read) claims it’s good or clear C. (Good C for those who speak J, maybe; I wouldn’t know.)

For a way to morph C syntax that does make things better, see libmill[3].

[1] https://code.jsoftware.com/wiki/Essays/Incunabulum

[2] https://github.com/jsoftware/jsource/tree/master/jsrc

[3] https://250bpm.com/blog:56/