Several DIYers have come up with very small LED "flash" units that do fit the Ike housing bump atop the hotshoe instead of the sync cable to the internal TTL electronics and allow FO coupling right thru the housing wall, to fire Inon or other strobes (even Ike's w/ the FOadapter), but there's a catch... they only permit manual sync. A circuit that does full TTL communication with the camera and can fire and quench LEDs at the speed to be preflash etc for a TTL strobe to mimic is nowhere near as simple.
I did one but figured out pretty quickly that I wasn't buying anything over a sync cord than eliminating the watersealed electrical connex. Until Ikelite strobes support optically-coupled TTL mimickry, I don't see them adding the bump space. It just makes the next request "remove the TTL electronics from the housing...and cut the price" and helps sell other strobes like Inon.