How to turn my canyon aeroad into a tt bike?

What I did with my fixie was to fit a shorter (100mm) -35 degree stem with TT base bars and extensions to replace the 145mm 0degree stem and road bars that I normally use. A TT frame will typically have a 40-60mm lower stack and 20-40mm shorter top tube than an equivalent size road bike depending on your height.

the simplest thing would be to swap out the handlebars and get clip-on tribars but you may find that the position is too long and high.

Time to invoke the N+1 rule and just shell out for a Canyon Speedmax, I'm afraid...It's the law.

You would need to replace the H11 with a more rounded handlebar and clip-ons. Or either a base bar and clip-ons or an integrated setup. You'd also need brake levers and the Di2 shifters (£135).

It might be less hassle just to practice riding in the drops or on the hoods (with your arms flat).

With a good position, and frequent training in that position, the extra benefit of aerobars is less than compared to a standard drops or hoods position.

The benefit of di2 is plug and play. Either for a full TT setup handlebars. Fit di2 time trial switches in the ends of the extension bars, 5 way interface. Program functions and away you go.

I have done the same on my cyclocross bike with di2

Another consideration is a standard drop bar then adding on an aero bar extension kit with adjustable pads.