I have sailed out of USVI for several years. Except during covid, we always sailed into and out of BVI. If you only have 3 days of sailing (plus arrival and departure days) I would not go through the hassle. Highly unlikely you can make it to West End the afternoon of the first day. It's a 3 hour motor from CA. So you are likely going to end up in Maho or Francis on STJ. A very nice place. By the time you get going the next day it will be noon before you clear into BVI. Coming back is the opposite problem. You can't get cleared in to USVI early enough the last day of your trip. You have to check out of BVI and check into USVI next to the last day. Even if you use ROAM you can't make it back to St Thomas and get re-fueled and onto the dock by the check-in time on your last day. So Sailing the USVI is great btw - plenty of sailing and bays to visit. But if you want BVI the time you have isn't going to make that work well.