My choice was, and remains, an Orion ED80T CF for my AVX. Which is a Triplet AP refractor telescope. 5.5 pounds if I remember correctly.
You are going to add a lot to that, I added 7.7 pounds to mine.
I can't fault that my AVX worked very well, and I learned a lot with it.
But it's electronic failures were it's death knell.
But the telescope is a good DSO hunting scope, and has brought me many, many great images. Over many, many clear Southern California nights.
It's light, but very stable and strong with the carbon fiber construction.
Carbon fiber is the best choice for AP as well, because it has the best thermal characteristics to hold the focus.
In the end, with all the foo-rah added, it came to 13.2 pounds from the clamp up. Which is nice and light for the AVX.
My AVX died it's final death last Nov (2019), and has since been replaced with a Losmandy GM811G HD mount.
At that time I replaced my Vixen style bar, with a Losmandy D-style bar and added a couple of pounds to my payload. Now ~15 pounds, 4 ounces. But on a 50 pound rated mount.
There are a lot of additional things to add in to the mix. A Guide Scope and Camera, Main Camera, Sighting apparatus (Red Dot for primary aiming), Adapticators, Filter wheels or such, and I have a laser pointer to show the kids where the telescope is pointed. (And boy, how that snaps their attention to what we are doin.)
But like mentioned, for the Asian mounts the Rule of Thumb is to try and keep your Photographic Load at or below 50% of the mounts advertised weight rating.
For DSO's like you are after, the smaller refractors are ideal. And they are your best telescopes for the light AVX mount.
We all start somewhere, and I started right there where you are. I spent over 4 months of intensive study on how to become a DSO imager. 5 years later here I is....
I'm way down the Black Hole and accelerating. Once you are in, and you are already in, you'll want to continue.