[Oldsguy]

I suffer from the same malady, hands/arms/body too big and not flexible enough to work well under the dash up-side down. I hate it sometimes. Perhaps just using some speakers in the kick-panel or under the dash in an open space for now and just leave the bad one there? If you are wanting to restore it to original, maybe you could find a small, wiry, flexible, dexterous person to be your friend.