What's the model number on those code converters? Those might come in handy for anyone who has a BS -000 (BS2000, 3000, 5000) and would like to use Beolinks or would like to tie any older systems together with their Beovision or Beosounds in the bedroom.
The Beolink 1000, 5000, 7000 and Beo-x remotes work out of the box with any stacks and flat systems ending on -500 (BS3500, 4500, 5500, 6500) and the more recent 7000 and 9000 stacks.
If there is a way to reverse engineer or otherwise the codes, I don't think building new code converters is too difficult. Nothing a microcontroller like an AVR can't handle.
On a side note: Would the Terminal 3000 work with a BS5000? Is it very different from a T5000?