In general, the answer is no. It's almost impossible to "consolidate" student loans anymore to reduce interest rates. And if HELOC is out...
The one thing I can think of is 0% credit card offers (that also have 0% balance transfer fee, and no annual fee, of course). Big back in the boom years, they petered off for a few years, but have come back within the last six months to a year or so. I've got about 20K interest free right now (sitting in a money market to earn a few percent, then I'll pay it off).
That could be a good way to reduce the interest a bit, though you likely won't get your whole balance done that way, and you have to make sure you pay off the CC as soon as it is going to earn interest.
Depends on you having great credit, of course.
Something to look in to.