Or, the only other way for now (I believe) is to buy a ProComp K6001B (or K6001BMX) for Titan, and install just the front-end lift. Then fabricate your own rear lift parts. As undesirable as that seems, I am leaning that way, as I grow impatient while waiting.
Oh! for anyone considering the above steps, while waiting for new rear-lift parts to materialize, I forgot an important step. If you are going to buy a ProComp K6001BMX (for the frontend lift), you might attempt a swap with your vendor. Try to swap-out the Titan (3" lift) MX6060 rear shocks that come in the K6001BMX kit. Because you WILL need 2 new Armada (6" lift) MX6112 rear shocks, after you lift the Armada rear 6 inches. I believe they are the exact same price/value, but they are longer, for 6" lifted Armadas. Now, as Pops has stated before, you could just sell the MX6060 shocks on TitanTalk, etc... However, you will need longer shock eventually, if you lift that rear. Well, that is if you have NON-Auto-Leveling like me.
In the air system, you will just need adaptors made to extend your OEM air-shocks to the appropriate length. As always, if I missed something or got something wrong, please jump in and help us out here. And, if I can make something for the rear (while we are waiting), I will keep you all in the loop every step of the way, of course.
( ProComp for NISSAN )
Model Mounting Lift Part # From
Armada L-L 6" MX6112 59005MX
Titan L-L 3" MX6060 59001MX