I didn't see a better way for access but to remove a bunch of wheel
well cover screws and bending it out of place.  You won't get clear
access unless you remove the shield, but I wouldn't, it looks to be a
pain.  Try bending it enough so that you can get your hand in and work
by feel, it should be enough.  Point a bright light in from the top,
it may help.  You don't have to remove the rubber grommet to poke a
hole in it, just use something pointy, and remember to seal it.

I would seriously worry about drilling through the firewall in this
car.  If it looked like an easy option I think I would have tried, but
who knows what you might accidentally cut through.

A quick look didn't reveal any usable fuse on the block, but that
doesn't mean there isn't one there.  This was a lot easier to find on
earlier American models, but since it was low draw I just tapped my
remote radar system into the cigarette lighter wire, in the center
console.  If you need a small amount of power and want to do this,
start by removing the single philips screw beneath the
ashtray/convenience tray.  After that I think removal becomes fairly
obvious.