I have beetle buckles, but also recently purchased the Superior Hammock suspension, which seems a close cousin to beetle buckles. The slots for the continuous loop on the Superior suspension is actually deeper and slightly narrower, and may perhaps solve the problem of the loop coming undone. I'm not sure of the weight difference (maybe I'll check that tonight), and if weight is critical, this might not be the best idea, but it may be worth it for you if it resolves your issues.
The buckle also has a hole in it that is specifically designed to accommodate alternative attachment techniques, so you could attach your loop permanently, while maintaining adjustability.
Sadly I didn't take closeups of each at this weekend's hang but here is a stock photo from the superiorgear.com site:
Superior Suspension Buckle.png
FYI, in the newest version of this, the inside hole of the piece shaped like an arrowhead is curved to make it more comfortable to pull the buckle and release the suspension to adjust.
Hope that gives you some food for thought. FYI I love and have purchased a lot of stuff from Dutch, so it's not a knock on him - just an alternate idea!
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