A large coffee dispenser (you know, the old aluminum sided ones, about 2 1/2feet tall, with a heating coil attached to a variac, and covered with a crockpot lid... Figure out the temps with a thermometer. In the side cut a hole for the neck of a large RBF, inserted from the inside of course.
The RBF is attached to a second dual necked spherical piece of glassware (like the bulb on a rotovap) that partially rests in a small trey filled with dry ice and acetone, or Sat NaCl and ice, with another straight glass tube attached to the vacuum with a flexible rubber hose that leads to a chilled condensor and then the vacuum pump.
You can actually have several of the bulbs attached for very volatile constituents.
The whole glass contraption is attached to a windshield wiper motor with a control spliced in to vary the rocking speed...