Okay, I have scoured the forum for bag options and see that OEM or equivalents are very limited. I am a 90% around the town, day trip rider and 10% road trip / multi day bike event. On my VTX 1800C the bags were off the bike way more than they were on. I had a set off BOSS #36 bags which were amazing (
http://www.bossbags.com/vtxclassic1800.html). Beyond the quality of the bag, being waterproof and locking - what I LOVED about the bags was the mounting system. When I took the bags off - no visible bracket. Just locking nipples that look like I blinged out the rear fender support bars. Pull up to the hotel, quickly detach the bags and carry them in like luggage. That all leads up to investigating options for mounting the nipples onto the rear fender (imagine may need hidden support structure underneath). I think this will just look like i tried to bling out the rear fender with studs - also can get black mounting nipples or powder coat them so they disappear against the black fender... Once my bike arrives I will do some investigating. Obviously lots of work measuring, clearances, etc. But it may work. Please shoot holes in my theory or offer suggestions.
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