You should probably put in for an ongoing search through II. Don't expect to see the full range of
DVC available through II. I exchange into DVC a lot through II and most of the availability is in May, end of Aug, Sept, Oct for, studios and 1 BR with an occasional 2 BR. It's mostly Old Key West and Saratoga Springs that make it to II. Yes other resorts and other times do show up, but not with any regularity.
I'm not saying that it's not possible to get DVC through II, just don't expect to have all of the options that you have with DVC points at the 7 month window, because the 7 month window is irrelevant. You basically have to choose from the few options that DVC makes available to II for exchange purposes.
You also have to consider that when trading you will have to pay the $135 exchange fee to II, the $49 guest certificate fee to II (somebody else gave you this exchange), and the $95 resort fee to DVC. In essence you will be paying an extra $279 to possibly stay in a smaller unit if all you can get is a studio.
If you do a search first then if you aren't successful you do not have to sacrifice your week. In essence with search first, you can decide when you want to go, and the smallest size unit that that you will accept. II will keep searching for you, if DVC becomes available great, if not you can always stay at Sunterra. Exchanging is great, but it does require a bit more flexibility.