Alright, thx everybody for thinking along… I found my solution:
Since it’s always better to use software you already own 
, I used EarMaster with some sensible settings for repeating chord identification questions (and not waiting for answers… 
), fed the output into an HSO ensemble pad with slow attack and release times, and behold, it worked! It is really a lot of fun, too…
Cheers,
Benji