Yeah, boiling in a flask is like playing chicken.I like it, I think that's a great idea.
Here's a trick I started doing lately when making bigger starters (maybe not so tricky to some, but it has helped me):
I boil 3/4 of the water i need directly in the flask a day before I need to make a starter. after it's boiled for 15 min or so, I cap it with foil and let it cool down on the counter and then eventually, it goes in the fridge.
The next day, I boil a super concentrated (4x) wort with a little over 1/4 of the planned volume. Boil for fifteen minutes, then cover and let it cool down on the stove. Once its cool enough - say about 150df or so, I pull the flask from the previous day holding just water, and direct pour the wort in and its usually right at 60df or so! Put in a sanitized stir bar and its off and running.
Just thought that may help some of you out there.
Me too, though I don't think the two-day process is needed. You could boil some water in a flask and wort in a pot. When done, pour the hot wort into the flask and let it cool. Since it's still hot the chance of contamination is zero and the starter will be ready to innoculate sooner.