Pick up a copy of the Trooper shop manual for the UK models and you'll find a different selection of Aisin 5-speed manuals to choose from, IIRC many are available here. I haven't done squat on hardly any projects since getting laid off last July so this is all from memory. My plan for the Ebony was and still is to put a 3.1L Isuzu diesel in with 5-speed and TOD for stage rally, with the specific idea of using as much OEM off-the-shelf components as possible. I'd love to go sequential with the gearbox, but even if I had a job the $$$ would be prohibitive.
But for those looking to do this definitely get the UK Trooper manual, it's available on eBay in CD format from several sellers just be sure to check the feedback out. I got mine for about $12 shipped and it's a great quality indexed PDF of the factory manuals.