I just spotted that Kaftan Media has developed a training board that allows an easy start with IOT2020 and IOT2040. This "trainer" is specifically made for educational purposes and builds on the success of similar boards for the Siemens LOGO! logic controllers.
As far as I can see Kaftan is currently offering quite a lot different, but useful books which are so far unfortunately only available in the German language. Since Kaftan has customers in over 30 countries it might be worth to ask whether they can support other languages too.