I've thought about this too, and the copious amount of time I have spent on here has led me to think hard about a couple of things;
1. The frame is a fairly small contributor to the overall aerodynamic efficiency of a bike + rider.
2. A lot of what makes a "superbike" fast is the front end.
You can emulate quite a bit of what a modern fast bike is doing with a bit of careful thought. You can get quite a bit of the benefit of an integrated superbike front end by using something like the Tririg Sigma stem and tidying up the cable routing. You might be able to upgrade your bars to something like a Felt Devox, or even the Tririg Alpha. And, at the risk of sounding like I work for Nick Salazar, you could do as you say and look at the Omega brake. You already have nice wheels and a power meter, you could put a cover on the back wheel. I personally wouldn't bother with Di2 as it won't make you faster unless the cable management is easier, but you might enjoy it and if it gets you out on your bike more then that will definitely make you faster.
To give you an idea, I ride a "Classic" Cervelo P3C, 2012. I put Felt Devox bars on there which are likely to be really aero, they are low stack which is what I needed. I fitted the Tririg Sigma XF stem and drilled the top tube to move all the cables out of the wind. I swapped the stock headset dust cover for a lower profile one, have a slamthatstem cover to go on there shortly. I fitted a Tririg Omega. Also have a disc wheel, Hed Jet front, a power meter. I'm not going to get to the tunnel, but I would be surprised if I was giving up very much against a recent well-rated bike, and it has my personal stamp to it. Couple of pictures below to show how clean the front end can be made with a bit of time and effort. I'm going to fit the Torhans Aerobento to the top tube by adding some bosses when I get around to it, and with a modification to push it right up behind the stem it won't be losing much to, for example, the integrated storage on the recent Canyon. The Sigma provides bosses for a BTA bottle cage, I mount the Xlab Torpedo in there.
1. The frame is a fairly small contributor to the overall aerodynamic efficiency of a bike + rider.
2. A lot of what makes a "superbike" fast is the front end.
You can emulate quite a bit of what a modern fast bike is doing with a bit of careful thought. You can get quite a bit of the benefit of an integrated superbike front end by using something like the Tririg Sigma stem and tidying up the cable routing. You might be able to upgrade your bars to something like a Felt Devox, or even the Tririg Alpha. And, at the risk of sounding like I work for Nick Salazar, you could do as you say and look at the Omega brake. You already have nice wheels and a power meter, you could put a cover on the back wheel. I personally wouldn't bother with Di2 as it won't make you faster unless the cable management is easier, but you might enjoy it and if it gets you out on your bike more then that will definitely make you faster.
To give you an idea, I ride a "Classic" Cervelo P3C, 2012. I put Felt Devox bars on there which are likely to be really aero, they are low stack which is what I needed. I fitted the Tririg Sigma XF stem and drilled the top tube to move all the cables out of the wind. I swapped the stock headset dust cover for a lower profile one, have a slamthatstem cover to go on there shortly. I fitted a Tririg Omega. Also have a disc wheel, Hed Jet front, a power meter. I'm not going to get to the tunnel, but I would be surprised if I was giving up very much against a recent well-rated bike, and it has my personal stamp to it. Couple of pictures below to show how clean the front end can be made with a bit of time and effort. I'm going to fit the Torhans Aerobento to the top tube by adding some bosses when I get around to it, and with a modification to push it right up behind the stem it won't be losing much to, for example, the integrated storage on the recent Canyon. The Sigma provides bosses for a BTA bottle cage, I mount the Xlab Torpedo in there.