Asher,
What type of attachment does your strobe head have?
My first thought would be to remove the attaching screw from the AS plate, then screw into it from the opposite side something like a Manfrotto 013 spigot adaptor.
Really depends on what attachment the head needs, but I'm certain there's something out there that has your required head attachment on one end, and a 3/8 (or 1/4) thread on the other, that will screw into the AS plate from above.
John.