The trick here would be getting your spacecraft to be exactly Sun-antipodal from the planet you want to view, right? At multiple times Voyager's distance, its orbital period would be thousands of years, and any thrusting would make for impossibly tiny changes to your solar-relative angle.
Doing the math: the Wikipedia article says the solar focal distance is 547 AU, which would be an orbital period of 547^1.5 = up to 12793 years to line up with any particular target along that plane.
One proposal I saw would be a series of spacecraft on a one way trip that pass through the focal point and image as much as they can while there before going off on their way forever.
Doing the math: the Wikipedia article says the solar focal distance is 547 AU, which would be an orbital period of 547^1.5 = up to 12793 years to line up with any particular target along that plane.