Jim,
The heavy (orange) offshore planerboard release works for the 200' but for the heavier - longer setups you may wish to consider doing the following it is a bit more laborious but effective:
Stop your planer board 2/3 of the way out send the 200' out with the offshore then let out the 300-500 copper, attach a Scotty stacker release to the planer board line and set your copper in it, then let your board out the last 1/3 of the way. (I guess you could clip the Scotty stacker on to a shower ring and slide it down, but I like doing it this way because the deeper coppers are usually the most hit and I can recover the Scotty release and use it again without risking releasing/tangling the 200' while pulling the release back up the board. Plus I don't want to buy many $13 releases)
As long as your access to your planer reels is easy you can reset rather quickly. If the fish are hitting the 200' the most than this system is a pain in the neck and you are better off running just the 200' on one side and the heavy's on the other.
CC
PS. I use Scottys cause they came with my riggers and didn't cost me anything. There are many different downrigger releases that are adjustable (even roamers that slide) that will work for you.