I am kmp14. It appears I have 2 separate accounts on this forum, but only remember the password for this one (Kennyp14). Anyway, yes, it was REALLY HARD to get a tap on to that wire way up above the fuse panel. I think it took me an hour+ of contorting my body to finally get a working tap on there. Maybe the door panel approach you are considering might be easier.
Let us know how it goes, and if you have the patience, take pictures as you go so it can a useful for other in the future! Good Luck!