I wonder if anyone can help me out here 

I have a sissy bar with detachable “docking mounts”

Hey mate with detachable saddlebag brackets there is another set of those detachable mounts known as keepers which sit beside your sissy bar mounts. This is an old photo as I've had them on my bike before. The bolt that holds them together is longer which comes with the easybrackets. Really simple installation. Be careful which system you order though. If you order easy brackets make sure you order the kit that goes with the detachable sissy bar otherwise you'll have to buy longer bolts yourself. I've mentioned in a previous post that I'm not a fan of the easybrackets system myself, but if you order I'd recommend Finn moto as they're an Aussie supplier and you will get them a lot quicker than ordering from the states. As for saddlebags you will be limited if you need them by next month. I've waited 3 months for a set of aftermarket bags from overseas before. Id' recommend Aussie suppliers if you need them quick

Also just a thought, if you like your bike without saddlebags but need occasional storage there's the option of a barrel bag. Just Google bikers friend. If you have a luggage rack on your sissy bar there's way more than enough room in the large one for you and your missus gear. Just undo the straps and carry it into the hotel with you. I've had one for 7 years which I use on long trips interstate. They are really high quality, solid and I can't say a single bad thing about them. I have rigid locking hd saddlebags now so I don't use it as much as I used to but does still come in handy for carrying bulkier items.