Jake
It seems you might just have one big problem...IF you cant turn the engine over by the crankshft bolt on the front.
Then you wont be able to undo ALL the TC bolts, 6 offf them.
So IF that is the case then you will have to unbolt the gearbox from the engine and pull it off.
Then you will be able to spin the TC round and get to all the bolts.
When fitting the TC back onto the Box shaft,offer up the TC to the gearbox, and slide it on, it will slide on and stop, now you think it will not go any further, but it WILL...grab hold of the TC and spin it round with a little pushing motion, and keep doing this till the TC locates onto the shft properly.
It might take a few mins for it to pop onto the shaft correctly, it will only drop in about another 1/4", BUT it will locate,all your doing is locating the shaft into the TC pump drive.
Oh and you need to put the box AND the TC onto the car together, and try and keep the engine tilted back slighly, so when you are offering up the box, the TC dont slip forward...then it's back to square one.
And you can get to the bolts through the blanking plate, we did ours last weekend, it's a little fiddly, or use the starter hole to undo them.
Andy
PS
tip get 2 small trolly jacks and put the box onto them and offer the box up at a slight angle, be sure the trolly jacks are inline with the box and it should be a lot easier for you to get the box back in.
PPS
make sure you fill the TC with fluid before putting it onto the box.