Stefan, I'd go for a bigger guide scope than the ZWO...something with more aperture and focal length. The Celestron package that Glen mentioned would be a better fit.
The thing with guiding is that you want to catch subtle movements before the main camera sees it. With the 1200D, the pixels are small and at >1200mm focal length you will readily see any guiding errors. The more light and detail you can throw into the guide scope the better IMO.
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