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Without reading all of the links, or knowing anything about this specific terminal, I will say the following:
Some devices made in the past, which could show a picture on a TV of the era actually produced a non-standard video signal, which was close enough to work on the TV sets of the era.
If at all possible, try to use the terminal with an era appropriate monitor, and see if you have the same problem. My guess is that you will be able to tweak the controls on the monitor a bit to make it stable. My guess is the converter likely expects a signal exactly conforming to standard, and the terminal just can't/won't do this.
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