The UW has more than one track for early college entrance, one of which is aimed at entry after 10th grade. Doesn't include a high school diploma, though. That program does appear to accept some out-of-state applicants--at corresponding out-of-state tuition, though, for the first two years of college.

Several states have widespread early college programs, with several years history, for this target group. Here's one version: http://www.jff.org/initiatives/early-college-designs/schools

Our experience in my workplace has been that the students who are motivated, and make use of supports (family, advising, freshman seminars) generally have good outcomes. Those who try to go it alone tend to struggle more.

My personal experience was positive, but I was a commuter.

...pronounced like the long vowel and first letter of the alphabet...