I merely gave you another option to choose from the variety of which the Anti-Flake routine could go. I cannot simply go out and say "Do this" or "Do that", because it's ultimately your option what you choose that feels best for you and is congruent with you.
Also, I might add that "playing it safe" will get you nowhere fast always, especially with a smoking HB. Because you give her control and ultimately lose attraction for you.
It really depends on how you look at things, in regards to being perceived as an ultimatum. You're listing some qualities she has ( and have made known already...twice ) but at the same time, you are not going to sit around for her answer, even if it's a yes or a no. An ultimatum sounds to me like an angry guy going "Bitch, you better do that or else".
What I have in my head when telling her all this is this calm but firm message that actually says "Hey, here's your chance at the two of us having some fun by my rules. I have a lot of options and from those options I choose you. If you say yes then it's a win win situation, if you say no, it's truly your loss. Take it or leave it, I don't care". So from my point of view, it's not an ultimatum, it's a "take it or leave it".
Since it's like the third time you ask her out, you pretty much have to put your foot down. You've been overly eager to meet her and she knows this. This is the safety blanket you need to get back in the driver's seat.
It's your call. High risk, high reward. Ask her out on a date for Tuesday, for example.