If you're not ready to take that kind of plunge in terms of general salary, health insurance for 90 days probably isn't going to change that.
In such a case, a good alternative is to join a well- or reasonably well-funded startup.
However, I'd think it would be great if an accelerator would act as an umbrella organization, letting startups buy cheaper health insurance while small, through aggregation, even after the initial accelerator commitment is done.
Most people don't know enough about health insurance (because they're usually getting it from their employer) but getting group insurance is possible even with a "group" of just 2. You just have to do your homework.
Perhaps something accelerators could do is perhaps provide some guidance on the HR side of startups, including how to deal with employee benefits.