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In terms of minimal computer mounts for aero bars, it’s hard to be 3T’s Compact Computer Mount. It is simply a molded carbon-fiber armrest that has a stub sticking out to the inside.
While this can work on the left side or the right, your one limiter is that it is only designed to work with 3T’s Aura and Brezza aerobar lines.
The basic idea is simple. You remove the armrest on the side you want the computer. You install this armrest in the same position. You’ll need to get a little Velcro tape to line the armrest. Then, with the rest mounted and taped, you can apply the pad from the previous armrest.
This mount weighs 55g in total. The armrest, without the stub weighs 25g. The diameter of the little bar is 23.5mm, a shade larger than the extension diameter, but still small enough that whatever might fit to the extension should also fit here.
The 3T Compact Computer Mount is an elegant, simple solution to a vexing problem.