I have had first hand experience with an AEM running everything but wasn't particularly impressed. It was passable, but the software was a flaky. I should also point out though that AEM is a bit of a rarity over here and as such there are very few people who really know their way around the system. Whilst there were some bits that I thought left a bit to be desired I'm certain that a few of the apparent 'short comings' were down to our unfamiliarity with the ECU/software.
What we tend to do over here is run with standalone programmable transmission controllers - Prettymuch all of these come out of your country.
Whilst I haven't heard of anyone specifically employing one of these on a Landcruiser transmission, they are commonly used on the smaller A34x out of the Aristo/Crown/Supra which should be no different in operation. i.e. Two shift somenoids to give 4 possible gear positions - 1,2,3,OD, a PWM solenoid for line pressure and a converter lock solenoid. The controllers just need throttle position, speed, RPM etc and you can either run them as outputs off the ECU (depending on ECU of course) or just the signals off the same sensors as the ECU.
A
PCS unit should do it - maybe bounce them an email.
And I'm sure
this one is also on the radar for you guys.
Buying a full-house ECU and a trans controller can get expensive - but perhaps consider something like a Haltech Sprint 500 and a trans controller. The 500 is a pared down ECU that has most things that are critical, but leaves out some of the other more racing focussed features and is only 60% or so the price of the full house haltech systems.
Alternatively you can look at sending the factory trans ECU the required signals from the aftermarket ECU.