Brent....
You can do that by snipping the hook shank off a small aberdeen hook and slipping the smaller hook in along the regular hook making certain the remaining stem fits into the head cavity far enough. Do a dummy set-up by putting everything in place, then gently and carefully closing the mold down on it all. Keeping pressure on the handles and having the mold flat on a solid surface, give the mold a sharp snap with a hammer near the handle end and then near the hinge end but being certain that you hit where the cavities are and not on edges. The soft mold metal will conform to the extra metal of the other hooks. You will end up with a small amount of "shoot-thru" if you your cast without the small hook but that is easily nipped off when the jigs are cool.
Based on the pic you provide, I'd just order the ballhead mold designed for the keeper wire and use the wires. You'd get the same thing and not have to cut up any additional hooks. The guys on the Mississippi River in this are use the ballhead with the keeper wires for dancing crawlers and have good success doing it.
