Unfortunatly, your in a bad situation we had one at our shop about a month ago.....and never again will I try to repair one again. Option #1 would be take to dealer(I know they cost two much, but they may have enough experience to open it with out destroying the door panel or door in our case) I know i'm going to catch hell on that one. We tried going through door up top but all we ended up doing was rip out latch bolt holes and ended up getting a used door to repair ........ $700 dollars later we fixed it.
Option #2 take out seat is a good try, but be careful when taking seat out, and then peel back door panel. Might be easier on 4 door, we did it on 01 coupe. Honda may have someone who's done it a coupe of times and knows a trick and can save you money and a headache.... Sorry ...........