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The bulk and weight of a 120mm refractor ( I own one ) in its case is about the same as an 8" F5 Newtonian tube assembly .
I would recommend something like a 6" SCT on a Skywatcher AZ4 mount for something fairly compact and light with useful light gathering and focal length , and Dobsonian like movement ( the AZ4 is essentially a push too style mount with large teflon bearings and adjustable friction clutches with no need to lock the axis or grapple for a slo-mo knob or cable in the dark ) .
Just noticed you intend to still use the HEQ5 - probably would still recommend a c6 - you would be too disappointed in the light gathering if you go from an 8" down to a 4" aperture .
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