if your planning on controlling the whole thing through the Ikey, then you don't want a 2 way fm unit, as it will not work at all being controlled with the Ikey & even if you could get it to work you would have none of the benifits of a 2 way system anyway at that point.
I have never installed a system that was completely controlled by the Ikey, but I do know for certain that it is possible and has been done sucessfully... I doubt your planning on installing this unit yourself, so I would suggest you talk to your local shops that you are considering for this install & see if any of them can tell you, yes, I can do that.
really good installers are few & far between, I do know a guy in ny that I could recommend that has done this very setup several times on several fx's, but being in texas I don't think that would help you much... I know if I had to do such an install then I would research it & figure out how exactly to do this, but I've been out of the install game for many years so I don't have the exact procedure at my fingertips.
basicly a good installer will have either done this before or at least have the competence to research it & figure out how to do it, it can be done, now who can do it may be a little harder to find really... I closed my install shop way before anything like Ikey even existed, so I have no actual experience with it personally.
when I do my install, I will use a 2 way spread spectrum fm system & use the aftermarket remote to control it. personally I want the increased control and monitoring a good 2 way provides, & being able to check & monitor status of the vehicle from half a mile away is the reason for me to install in the first place... it bothers me that I will have 2 remotes, but I will not consider the Ikey a remote anymore...
I can completely uinderstand your desire to just have it all controlled by the Ikey though, I guess long range control & monitoring is not worth the hassle of 2 remotes to you. personally I will probably disassemble the Ikey & change the format of it's casing to have no buttons, not suggesting that to you really, but that's my plan anyway
good luck finding a decent installer, don't know anyone in texas to recommend to you though...