Long-time EV scene member Tony Williams of Quick Charge Power in the USA is now planning to offer a CHAdeMO upgrade for the Roadster. Having already offered such a product for the RAV4 EV (with similar drivetrain) this should be a relatively simple upgrade. The unit is roughly 28 x 12 cm so can be mounted in the trunk or other free space at the back of the car.
The price will be US $2999 and Tony is looking for several deposits to make this happen. See:
To me this sounds much more interesting than the $30k Roadster 3.0 battery upgrade…
One caveat is he is looking for people or companies that can perform the upgrade in Europe. We have one candidate in the UK but hopefully there are competent people in Germany too. It is apparently a relatively easy job, no more than 4 hours but needs high voltage expertise.