"Always ask" is a scenario that only happens when we have 2+ SIMs so it makes sense to have it in the >= 2 SIMs suite.
I also don't see how it would make the setup functions less clean. The >= 2 SIMs setup function would create the fake 2 mozMobileConnections, the simple click and long tap setups would set SIM1 as the outgoingCall SIM and the always ask would set always ask as the outgoingCall SIM.