In both canon and Legends, Force users who channelled their dark side energies into a kyber crystal form the basis for such corrupted crystals and the subsequent blades acquiring their signature crimson colouration.
There are also precedents of skilled Jedi purging such crystals of the dark side infused within them, thus purifying these crystals and, metaphorically speaking, bringing them back into the light. For example, in Legends it is rumoured that rare yellow-bladed lightsabers such as that wielded by Temple Guards use such purified crystals. In canon, we know that Ahsoka's Imperial-era white-bladed lightsabers were the result of purifying kyber crystals looted from a slain Inquisitor.
Is it possible to apply the same principle on Force users? I guess dark side users most probably cannot be "exorcised" and brought back to the light by force (no pun intended). However, can other effects be achieved? For example, a dark side user may possibly be severed, however momentarily, from his dark side powers when he has no dark side energies to draw upon, however momentarily. This is just an example from my own imagination off the top of my head.
Are there any recorded incidents, be it in canon or Legends, that suggest such purging procedures to be possible? If yes, what kind of effects can be yielded?