I would say that during an IFR approach, even a practice one in class G airspace, you would be heads down and therefore unable to keep your eyes outside as needed in uncontrolled airspace. So at the least you would need a second pair of eyes for the necessary lookout, and ideally a controller to keep an eye on the radar screen for you as well (if possible at the location you intend to use). I know that G does not provide that service, but it would certainly help if at all possible. For me, that would be a reason to contact a controller. I'm not familiar with Swedish airspace so perhaps I'm way off the mark here.