You can set the T11 up to change cutters from above the table:
1. Start with the router base-downwards on the bench, pref with the router plate still attached. Remove the 'elephant's foot' thumbscrew from the end of the depth adjuster (and the spring behind it, which is easily lost).
2. Rotate the preset depth turret (on the base). There's a point where the longer rods miss the body of the router, and the shorter one goes into the space where the elephant's foot would normally be.
3. Wind the depth adjuster up as far as it will go away from the router base (using the big plastic knob).
At that point you should be able to wind the router in close enough to the mounting plate to do a cutter change from the top (when it's back in the table). You'll have to reach up under to get at the shaft locking button, but it's not that hard. If it can't be done, check the turret rods aren't catching on something - there is a sweet spot.
Oh, and you can gain about 2mm by removing the paxolin (phenolic) base plate too. Beware - there's a grease packing inside the two columns which is exposed when you do this, so make sure the router fits well to the plate without gaps, otherwise sawdust will contaminate the grease.
I hope that makes sense.
E.
PS: I forgot to say: if you're worried about the proximity of the outer ends of the cutter to the hole in the router plate, don't forget you can always clamp some packing on top of the table, for example some melamine-faced MDF or just a plain piece, to lift the workpiece up slightly. It's probably best to have a piece that covers the table top. 18mm thickness ought to give you plenty of adjustment, and with those big wing cutters the T11 probably needs to run at its slowest.
PPS: don't forget the 20mm hole for the adjuster box-spanner (DAMHIKT!).