It sounds like you have a plan. Good luck with the implementation.
I had a similar problem, with a kitchen vent installed in my brew room, which proved to be totally ineffective even for electric brewing. Tried to use it on one test run, and haven't run it since. Was thinking of installing something like Brewbama did, but then tried a box fan in the window. The brewkettle gets moved as close to the window as possible. It does the job for my situation. I'm lucky enough to live in a great climate, so no worries about freezing in the winter.
Again, this is for electric brewing.