For a hillclimb TT (does it end at the top or come back down? it sounds like it does not come down.) Unless the flat section is long enough to make a big difference, I would forget any TT equipment - aerobars, aerowheels, aerohelmet are mostly just going to weigh you down when you are climbing a hill like the one you've described.
When it comes to climbing hills, in a TT its really just like any other TT. You pace yourself to go as hard as you can sustain, don't worry too much about anyone else, but climb at the pace that you can keep without popping. Do you know what your LT is? I find in a hillclimb I can keep my heart rate a slightly higer rate than I can for a flat TT (flat 183-184, hill 185-187). When you get to about 200 meters or so give it your all out effort.
don't worry about keeping your cadence really high - if you usually do 90-100, its OK if you are doing 70-80 - maybe even slower on really steep sections.
Warm up really well - even better than for a flat TT - this is going to be a really short and all out effort, you want to make sure your body is ready for it.



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in the pro 1/2 women's division). It was hell on earth, and I averaged a "blistering" 11.2 mph.
particularly on a hilly course.