Unless you have a lot of experience, I don't know that I'd find myself in a place that requires and ice axe and crampons. Granted, I do not own these, but the experts say that if you dont know how to use your ice axe to self -arrest then there's basically no point in having them. If you can't self arrest, you probably don't want to go where crampons will take you (or where they'll be required). I'd just get some good trekking poles and some microspikes and go to where you feel comfortable.
Now, I say all of this, I've encountered many people on my routes that have crampons and ice axes when I'm rollin in microspikes and poles. One of us is doing it wrong, and it might be me, so take that for what its worth.
I have had bad luck on serious trips with yak traks. They're good for pedestrian hiking where occasionally needed and a "nice to have", but microspikes are much more durable. I've had my yak traks break, which isn't surprising as your hiking along snow and ice with nothing but a rubber band holding on some steel under your feet. At least the microspikes have chains and can be reworked to reconnect if a link breaks.
Also, like Holg mentioned, you really need boots set up for crampons to use them, microspikes are a good intermediate solution.
