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Ok, here is a first version of my patch to implement os.environb:
 - os.environb is the bytes version of os.environ, both are synchronized
 - os.environ(b).data stores bytes keys and values on POSIX (but unicode on Windows)
 - create os.getenvb()->bytes
 - os.environb and os.getenvb() are not available on Windows nor OS/2
 - os.environ(b) et os.getenv(b)() accept both byte and unicode keys: that's maybe a stupid idea, I don't know yet :-)
 - fix #8513: subprocess: support bytes program name on POSIX
 - create os.fsencode() and os.fsdecode()
The patch is not done (the documentation should be updated), but it's a new step to help the discussion. I didn't tried it on Windows.
I already try twice to write os.environb some months ago, but I failed (it was too complex for me). os.environ and os.environb now share the same "data" dictionary, and their methods converts inputs and outputs if necessary.