I contacted David Dentry. I found his name mentioned on the Nikonians forum when searching for GPS port problems. In my problem summary to his attention, I did include quite a few links to support that the problem originates from faulty design, has been experienced by others, and the problem affects other Nikon camera models in addition to the D90.
Mr. Dentry's response was very disappointing. Will you please let me know if you have better luck?