The Allied Seawind II , designed by Tom Gilmer , has dual headstays , side by side .
You will need to beef up the masthead crane and go to a heavier backstay .

You can dual hoist on a good roller furling too , most have dual grooves so you can fly two headsails at once .
The Olsen 25 and C&C 40 that I race on , both have dual groove headstay foils . We hoist the 2nd sail before taking down the first .