Obryn
Hero
Okay, so you'd prefer a series of rebuilds, if that's how you wanted to run it, using whatever tools were available. Start by changing stats just enough to qualify and cannibalize a Rogue level or two. Next level, rebuild again, somewhere between where you are and where you want to be, removing a few more rogue levels. Level after that, you're a full cleric with some crime knowledge.The mechanics could match to my vision if that vision were of a guy who under miraculous conversion suddenly has his entire ability score array re-aligned.
In either case, as the rules stand, it may require house ruling or an advance module to rebuild.
In my current vision I'm imagining a guy more slowly converting and becoming better over several levels until he matures into a competent cleric, either by incremental proficiency advancement or even perhaps slowly adjusting his ability scores to be more convenient.
You fall? Well, switch those cleric levels back over to Rogue.
Easy peasy, no complex rules required.