Hi Guys,
I have been following this for some time and have been exploring a little myself. It seems, albert-e, that you are at least getting somewhere with an over-the-counter solution.
In contrast, I have been in contact with a manufacturer in China, who specialises in data adapters and claims they can do it. They have quoted a price, but only on a significant number of units, with upfront commitment. I just emailed them to see if they can prototype an adapter first for development. I can't imagine this being a fast process, but if they can get it to work, I should be able to get units into production mid-September, once I have completed my migration to Malaysia.
Hopefully not much longer!