Not much in the aftermarket area. Hedgehog box launchers are not available from either of the people who I thought would be the best choice, White Ensign and Veteran Models.
Gold Medal Models does make a PE Hedgehog as part of their England/Buckley PE
Look toward the right 1/3 of the fret
But you would need 2 frets to fulfill your needs
Your course of action may be to buy the Trumpeter USS England kit and use the kit's Hedgehog and cast resin copies of it for use on your subject