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my plan for a cheap undequilt for hammock camping this summer is getting a half down bag from aliexpress which has a zipped hole in the bottom https://www.aliexpress.com/item/Naturehike-Factory-Store-Ultralight-Half-Chest-Strap-Duck-Down-Sleeping-bag-outdoor-camping-hiking-goose-Down/32846397564.html
laner-
I personally wouldn't even entertain the idea of buying a down product that wasn't from a reputable brand.. and even then to a degree, but it's each to their own.
The other thing worth noting is that with only 150g of 650fp down, I'd take the temp ratings with a LARGE pinch of salt. A Rab Neutrino 200 is a full bag with 200g of 800fp filling and it's ratings are only 1-2 degrees better than the nature hike. I'm sure the nature hike would be better than nothing but not even close to what they claim.
ThePeginator
Hammock £10 from Decathlon.
Used it with an Alpkit Airo short mat, and Pipedream 400 bag (rated to -5°C), and a (very poorly rigged) tarp over the top. I'd taken an inflatable pillow, but swiftly discovered it wouldn't be needed in the hammock.
No wind to speak of, I think it was 8/9°C last night.
I was plenty cosy and warm in the bag, except for any parts in contact with the hammock - feet, and at one point shoulders when I shifted off the mat a bit. The way the insulation in the sleeping bag compresses beneath you really reduces its effectiveness. Sleeping position was pretty comfy.
Overall, I'm not sure I'll persist with it, as I'm not sure I can justify buying an under-quilt.