One such program that I know of and use in conjunction with pandoc is enTangleD[1] which supports editing on both at the cost of comments embedded in the source

One such program that I know of and use in conjunction with pandoc is enTangleD[1] which supports editing on both at the cost of comments embedded in the source to keep track of blocks. All that's really required is folding of the comments to get half way to the desired IDE. [1]: https://entangled.github.io https://entangled.github.io