The rural comprehensive system, though, is not solved by having a grammar school, is it? If that rural comprehensive was changed to a rural grammar plus a rural secondary modern, then if you pass the 11+ you have 1 choice, and if you fail it you have 1 choice. As I said previously, that would work slightly better (at a statistical level) for a small number of high achievers, but less well for a large group of middle achievers, whose options are dramatically affected by a single mark in a single test on a single day at the age of 10 - and no better at all for the population of children as a whole.
Having all abilities together in a single rural school does at least mean that a reasonable range of subjects can be offered, even to those with 'spiky' profieles who are able in some areas but might not pass the 11+.
My DBros went to a very, very small rural comprehensive (just ex secondary modern) with an intake of 60. 8 subjects were offered for GCSE, because the school were basically only staffed at just above 1 teacher per class - with 11 or 12 teachers in a 10 class school, there wasn't much room for a variety of options.
They did, however, make active use of facilities in local colleges etc, with day release or taking whole classes by bus for afternoons so that a wider range could be offered.
The local sixth form colleges - all 10 - 25 miles away - were also used to catering for 'from scratch' teaching of e.g. additional languages, because their intake was largely from such small rural schools.
i suspect nowadays more use can be made of distance learning / technology. My local comp offers additional languages as after-school options (so a child could theoretically leave with 4 language GCSEs - 2 in school time, 2 after), so if they can't be timetabled within the school day this is another option if the school is creative about it.