"change symbols based on line absolute number. && on even lines AND on odd."

I'd make that so it's on even significant lines of code.

So you can't just leave a blank line to leave the rest of the file syntactically correct.

And of course enforce no braces on single line bodies, and enforce the first brace to be on the next line as the if/for/whatever statement (so that the parity of the SLOC number changes if a single statement body turns into a two statement body)