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Assuming your using it visually, both a diagonal mirror and the eye piece will add focal length components. Each EP will have a different focal point. The published 1200mm simply refers to the distance to the focal point. Most refractors designed for visual use will have adequate racking range to suit EP focal lengths.
Now I have, in the past owned a Bresser 150mm f5 with that Hex focuser, and I even used it for narrowband imaging when I started with imaging. It certainly was capable of supporting a camera and filter wheel without issue. My point being, a focuser upgrade on that Bresser is not necessary, imho, and likely a case of over capitalising the scope, ie, you will never get a higher resale value when you eventually sell it.
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