I started back at it at 9:30 AM this morning. It is now 2:30 PM and I am finally FINISHED with the oil change!
I took everyones advice to get the dang nab nut off. I added 3-1 oil and then almond oil later. I soaked it, I rubbed it in, I put a rag on it. I tried double wrenching, rubber mallet, pulled back and forth.
Did I mention it is 98 degrees and humid here? Sweatfest does not even begin to describe this event.
Are you guys ready for what finally worked? I laid on the ground and used my FOOT to push the wrench...and it finally broke loose. Alleluah. (I may not ever reveal full details of how I did that...it's a little scary.)
Wooosh - oil pours out. Thank you thank you thank you.
Completed draining including tipping the bike to get it all out. No problem.
Note shallow, narrow drip pan. Made for better clearance when trying to remove nut.
Step two. Remove allen bolts from case. Pulled out the tool needed. Not one bolt would budge....AARRGGG!!!!
Rinse, lather, repeat bolt soaking procedure.
While waiting for all this bolt soaking, I ended up doing a lot of other maintenance on the bike. All the cables are now lubed, every other nut and bolt checked for tightness (huh), cleaned the whole bike, waxed it, oiled what needed oiled, greased everything else, polished the chrome, checked the brakes. Looking downright spiffy, even if I can't go anywhere because all the oil is drained out.
Another hour of whacking away and oiling and soaking until, at last, the allen bolts surrender to my merciless cussing.
For future reference the 2006 model uses a 14 mm wrench, and a 5 mm allen wrench on the case, and OEM part number 16510-37450 oil filter.
Thank you one and all.