Ugh. I forgot the TT standard brake levers were so freakin' expensive when I did my rim brake Di2 upgrade. You would give up the integrated Di2 buttons, if that is important. (It was to me, and one of the key reasons I chose Di2 over eTap for my TT bike.)

So... don't forget to add-in the cost of a pair of remote Di2 shift buttons to get a better apples-to-apples cost comparison.