My wiper hole was filled by welding a plate in from the inside then skimming filler over the outside bud....i mite weld a plate behind the windscreen wiper hole and filler over...
I prefer front plate in the middle, keeps the car looking balanced if you get me
As for the handbrake, you can get black plastics for every piece that surrounds it if you want to make everything black? That's what I've done, but I've only come across one micra in the scrappies that had the black plastic and black carpets in it (and I think it was an 02 facelift facelift mate, which might be hard to find where you're at unfortunately )