Removing a widespread bathroom sink faucet

[Oldisgold]

As in the pictures shown here, the metal t does not allow the Kobalt tool to reach the nut. Basin wrench does not grip this nut either. Not enough space for a plumbers wrench either.
The faucet handle was loose and broken so need to replace with a new faucet but need help taking this thing out. 15+ year old faucet came with the house when it was built. Please help.

 

[Geofd]

Does the chrome escutcheon come off usually there is a big nut you can loosen and the whole assembly comes out

 

[havasu]

Loosen the nut on the underside. Push up and rotate escution counter clockwise, and everything should drop out.