I don't believe ikelite supports eTTL for non ikelite strobes. I'm not sure about Subal
I do know that the eTTL circuitry in the ikkie housing needs power, it get this from the Ikelite strobe. Other strobe manufacturers cannot (do not) provide this power.
I have an ikelite 5D housing and an inon z240 and I'm going to try and modify the ikkie housing to fire the strobe using a fast LED via fibre optic. But I'm a way away from implementing it.
G