Well, for now at least, my mod is up. If you just want the sneak buff, you can download my mod (V1.6), and just use the Base.CharScript file. That also contains some other changes like code for an ability, and buffs to guerilla and speedcreeper to give you buffs on going invisible, buffs to the anaconda (chance to weaken on crushing damage) and demon/iceking talents (heal 5% of water/fire damage), and code for a status steal ability (which uses the cursed status if you have pickpocket skills, though, so it could be OP with malediction, which I remove the ability to curse with elsewhere.)
http://www.nexusmods.com/divinityoriginalsin/mods/68/?
