Flip the seatpost, install split nose saddle, clip on aerobars, slam stem. Consider cranks. That (and the right guidance) will get you within 1 mph of an optimized position on an IAx, for example. Biggest aero upgrade to this set up might be an aero section drop handlebar that still accepts clip on aerobars. I think the AR3 was coming with just such a bar, at least as of last year.

Great bike. My $0.02... get a second seatpost that you have mounted to your tri saddle. Then, the exchange is just a simple seatpost swap, and you can keep both seatposts marked for their proper heights. Then, figure out a similarly easy cockpit exchange, you you can wholly convert the bike in under 10 minutes.

It's probably one of the better candidates for a "dual use" bike. But, to make it really work like a TT bike, I think you need di2 so you can add shifting to the extensions. I agree with the above about getting a second seat post. Most of the higher-end versions (AR3+) come with 3T aero road bars that have enough round section in the middle to add clip-ons. If you wanted something really slick, the new Vision Metron 4D Flat M.A.S. would fit the bill.

That said, it's not a cheap proposition. For the price of a di2 AR2 plus cockpit upgrades, you could just about buy a Cervelo S2 and P2.

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"They're made of latex, not nitroglycerin"

 I have the AR 5 that I upgraded and have been doing exactly what you are asking about. I also have a TT bike but sometimes I just like to race the AR. (Hilly courses) It's a very versatile bike!

Thanks for the feedback, greatly appreciate it