D rings will work well. I have a set on my small pack that I might use, though I usually take my larger pack... but maybe without the step bag in there I won't need as much space.
Currently I have a webbing g-hook on one side and the bino harness clip on the other. The G-hook came from Amazon as a test saddle leg strap mod that I ended up not liking. Only bought one as a test.
I have four steps in the bag (3 WEs and a Primal) so it is a reasonable weight bulk on my front that should balance out with my pack on my back. Again, the true test will be how annoyed I get on a long hike with this baby carrier setup.
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