Freehub overhaul vs. flush and lube

I have a Deore LX hub that's about 20 years old and the freehub is sticky. I'm comfortable removing the freehub and making a spline tool to disassemble it if it comes to that, but I wanted to ask for opinions on doing a full overhaul versus flushing it with solvent and lubricating with a heavy oil. I'd rather do less work, but how long would tenacious oil effectively lubricate the bearings? Won't solvent remain in the freehub and make it even less effective? If I overhaul, how likely is it that park grease won't eventually run and impede the pawls? Anyone have thoughts or experience?