Hi Andrea, $1000 is generally hard to do astrophotography, but I'm also in a similar challenge to put together the most affordable astrophotography setup possible. I think a good starting point is already what you've got--just starting with a DSLR and some decent lenses, seeing that you're already into photography and long exposures.
There are some mini EQ mounts for cameras like the Skywatcher Star Adventurer or the iOptron Skytracker. They go on top of a regular camera tripod. I know the Star Adventurer takes up to 5kg and has an option to add a counterweight. So in addition to your camera, it will take a small scope.
I had a chance to play with the Star Adventurer last week with just a wide angle camera lens. It seems to be happy with a small scope like a 90mm Cassegrain or a small refractor but I haven't tried that yet.
Of course, if you see a "real" EQ mount up for grabs in classifieds or elsewhere, go for it!
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