I think you are making a fundamental mistake (several, actually). If your primary, nay, your exclusive goal is to see the the aurora, stop focusing on Iceland, or Norway, or Sweden. Despite great marketing efforts to fool people into thinking there's something extra magical about these places for seeing the northern lights, there is nothing particularly unique about them. There may be (and there certainly are!) other good reasons to visit those places, but your chances of seeing the aurora there are exactly the same as seeing them in any other place on the globe of roughly the same northern latitudes. Alaska, Canada, Greenland, and Russia all have plenty of places that are just as far north (even farther north, actually). Those places just haven't made the effort to monetize the aurora as effectively, as say, Iceland has. People seem to have been convinced that there's some magic oozing from the landscape in Iceland that attracts the aurora. Meanwhile, you pay $20 for a glass of beer, and i-don't-want-to-even-think-about-how-much for a nice hotel room there. In fact, while going to the far north certainly doesn't hurt, it's actually not critical -- there are other factors with a greater impact on your chances.
I've been around a bit, spent months in some cold, dark, northern places. Best auroral display I ever saw? Near Detroit, Michigan -- a city that has clearly failed to adequately fund their "northern lights tourism" marketing efforts.
Before spending an arm, and a leg, and other body parts, to book an aurora tour in Tromso or Oulu or Nuuk (or Detroit), please take a look at this old thread, and my posted reply which explains really what you do (and what you do not) need in order to see the northern lights:
Northern Lights
There are no "cheat codes." No "one crazy trick." Nothing that "has been banned from the internet!"
Mostly you need to be in the right place at the right time, and then, you need to be lucky. If you're lucky enough, you can get lucky almost anywhere. If you're not that lucky, you just need to be extremely patient (days, weeks, months, years, depending on your luck). You can do everything right, be in the ideal place, wait a long time, and still not get lucky. There are no guarantees. That's life.
Hope that helps. (And my apologies to the Icelandic Tourism Association).