It's nice to know there are at least other parties interested in this possibility, despite how "out-there" it may be.
...I think it's worth keeping in mind matters of market share. If there's only a few "games in town" for a particular OS, you've got THE market share.
No conversion like this is easy, though. I presume Il-2 works off of DirectX; Going to Linux would require re-working the graphics engine to OpenGL or Vulkan/Metal, or whatever they call it now. On the bright side, that's also what is used on a Mac, so if there was a Linux port, you could probably also work in a Mac port as well with much less difficulty.