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ZWO ASI 120mc + your 70 x 500 should do the trick. The ZWO has an ST4 output port to talk directly to the mount via the PC control of course. ( So does the QHY 5 II for that matter )
Both of those are also good planetary cameras for which you don't require guiding ( video mode ) so dual use. And supposedly they are both entry level Deep Sky Cameras with a bit of tweaking with the software.
I'm using the ZWO for planetary. My guidescope is the SW 80f5 with a Phillips SPC900 camera and a GPUSB connection. Once you figure out the right settings it works extremely well. If I ever manage to acquire a 'real' DSO camera I'll move the ZWO to fulll time guiding duty and discard the GPUSB hardware.
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