> Since 177 macros
> (the proposed option 2) work equally well with keyword objects as :foo
> or foo: symbols, any call/kw expression using R7RS-large keyword objects
> would also be a valid 177 call/kw expression.

Well, R7RS-large syntax using :foo as an identifier would have to be
translated to (values :foo) if converting call/kw expressions to 177
syntax. But that would be a very rare case, and the cleanliness of the
standard would be preserved.