You have a few challenges ahead of you; political ones, technical ones, and fiscal ones.
Are you just hoping to be the initial voice of inspiration and get everyone behind you? Or are you ready to be the advocate for the two factor auth you're proposing? Unless you've done your research and you know a lot of others in your department are on board with this proposal already, your proposal is going ground itself without much more than a candle flicker.
People tend to be really resilient to change, even really bright tech folk. "Good enough" is the motto that most people live by, so you're going to have to make a really enticing argument or get a lot of support across the board before even presenting this. Check with the necessary Systems folk; do they have ideas or wants or problems with a Two-Factor auth for users? Do the math for your accounts; are you saving enough money that it will make someone look good? Check with your Help Desk/Ticketing software; are password resets really enough of a problem that they're impacting people's work flow?
I promise you that most folks in a position to make a decision like this aren't staying up at night wishfully hoping that someone suggests TFA for the company, and few non-tech people in the company are even going to know what the hell you're talking about.
You're going to need to be prepared to really explain your idea and show that it already has support, else they're just gonna look at you like you suggested catapulting the ring into Mordor.