Thanks Greg. Very, very helpful. With WPORV being 148,100 SOs for a 2BR and 81,000 for a 1BR, a fairly cheap resale mandatory SVV Bella/Key West 2BR worth 81,000 SOs suddenly would look like a reasonably economical way to access Kauai. May have to add that to my list of future options.
Our goal is the ability to book 3 weeks in Hawaii EOY. Our 7000 "new" HGVC points give us access to Bay Club/Kohala Suites/Kings Land/Ocean Tower on the Big Island, and our pending EOY Odd Marriott MOC gets us Maui. So two weeks down and one to go! For Kauai, an EOY Odd Marriott Waiohai for about $3000-$3500 looks appealing, and maybe the StarOptions could be an alternate path. A second week at MOC has some appeal as well, but unless it could be enrolled in Marriott's points system cheaply (not likely), it wouldn't offer us access to Kauai.
We hope to have our EOY Odd Marriott MOC in our account by the end of February so we can start looking for a March 2019 week on Maui. Then, instead of using our HGVC for the Big Island in 2019, we hope to take advantage of the usual HGVC RCI March 2019 bulk bank to burn some leftover RCI TPUs that we need to get rid of, and snag one of the HGVCs in Waikoloa (recognizing we still have the HGVC points as a back-up). Since we don't yet own anything specific for Kauai, we'll either just go for two weeks in 2019, or rent a few Marriott Destinations Points to add to our remaining 2019 DPs to book Marriott Kauai Beach Club (if we decide on 1BR) or Marriott Waiohai (if we determine we need a 2BR). Leaning toward the DP option right now, we just need to figure out if one or both of our kids might join us for one of the weeks. Using owned/rented DP points would cause the Kauai week to be the most costly of the three weeks, so before the 2021 use year we'll need to figure out a longer term strategy for that third week.