I managed to load Chainer under VE Pro (32 bit) and Play under Chainer: I could see Play's GUI, by I couldn't interact with it (pressing button doesn't seem to work anyhow).
Then I tried a different approach: I opened Chainer and loaded Play into the first slot. The GUI works fine there, then I was able to load a patch of Voice of Passion. Now I saved that configuration as a preset. I went back to VE Pro, opened a VST track with a Chainer instance and loaded the preset I saved earlier.
The strange thing is that now I can interact with Play's GUI.
The strangest thing is that Play doesn't play (ahahah): I can see the incoming MIDI led activity on VE Pro track, but Play doesn't produce any audio.