The best way to deploy them is by making them fall onto the ground from above in 'pods' WH40K style ofcourse, using controlled cave-ins it would be a viable option.
Actually, there was a discussion about this earlier; what you need is a chute that the dwarf falls down. At the bottom of that chute is a 1x1 room with a chained animal and a door that is not pet passable (so the animal always stays in the same spot on top of the chain). Any z-level fall onto another creature will always result in both creatures merely being stunned for a short while. So, a dwarf could, in theory, fall 90 z-levels onto a cat, and be ready to fight 5 frames later. No cave-ins, no risk of injury, just dwarves where you need them, ready to fight.
As for the design of the room, I'd go like this:
ADSBHDA
A-Armor stand designating a barracks
D-Door that is forbidden but set to internal (so the barracks extends though it to the spot where you want the dwarf to stand)
S-Spears for danger room
B-Bed, and possibly booze and food stockpile
H-Hatch to deploy you dwarf
Normally, you have the dwarf train on the stand to the left, but when battle rolls around, change it to the one on the right, open the hatch via lever when the dwarf is in position, and send him off to battle!