CZ 82/83 do NOT have a decock feature, they are set up to carry safety lever down (=off) and DA/SA operation or cocked and locked with all SA operation*. The thumb safety lever is easily operated up or down, but it only goes up (="safe") if the hammer is cocked.
* (barring dud rounds)
Personally, I'd go with the C&L route if you're used to a frame-mounted, down-for-fire, thumb-operated lever, like I am. If your training and muscle memory are set up for DA/SA, then go that way and remember to take all needed precautions lowering the hammer on a live round, which is fairly easy with the hammer design on my 82, even if it isn't a practice I engage in without a safe backstop.
The CZ82 is probably the best deal in surplus handguns right now, I'd pick one up along with a case of ammo** and some spare magazines.
** (hell, if I had it to do over again, I'd have just bought all Silver Bear, the JHP is cheap enough to plink with)