@CloseTheGap Well done for wanting to address this and being willing to use your platform, even though you are in the minority. 
As an outsider I'd say - are there already initiatives the org has started? It might be easier to strengthen your argument if it aligns to previous staff survey results, damning exit interviews, a new strategic plan or gender pay gap reporting etc.
Are there are pressures to be more inclusive (promises to shareholders, vocal customer groups, signing up to industry initiatives to be more diverse) which could also be added to the argument?
Appreciate this isn't what you were asking. I'd also ask, what is it you want to come from your review meeting on this topic?
A) Your boss to say 'Close the gap' - I totally agree - can I task you with setting up a women's network/an inquiry/a plan/a staff survey
B) Your boss to say, I agree, let's work together on coming up with a plan
C) Your boss to say, you have my agreement for you to raise this with HR etc
Have you had a chance to work out the decision making around this sort of thing? Is it the SLT (do you sit on it, sorry wasn't completely sure from your post)? Can you get some allies onside? Where is HR in all of this, assuming you have one?
Obvs I don't know your org, but I wondering if the barrier won't be acceptance of the idea (or maybe I am being very naive!), but what can be done about it and if you are the woman raising it they may well expect you to have the answer. So if I were you I'd want a clear idea in my head of next steps - it could be a great opportunity!
On the topics of meetings, I often try to bring women back in (even if I am not the chair) if they have been blocked. "Chair Dave, can I encourage Sarah to continue?". Or "Sarah, I think you were just saying something?"
If you want to go in softer, maybe suggest some sort of effective/strategic meetings training, which can include role playing around bad behaviour etc. Would it be appropriate for you to set something up and run it?
I am sure you have thought of this, and maybe it would be difficult due to the fact some will be competitors, but I would connect in with women in tech networks. I am sure you are not alone, and they might have case studies of what has worked.
Good luck.