I have to say that you're doing what engineers do best...over thinking the problem.
If I'm understanding what you're thinking correctly, I would bring both ends of the strap together, tie a marlin spike hitch in them as if it was a single strap and hang a single whoopie sling on that.
I'll chime in here as a fellow Dutchman. There are sadly no vendors of Dutchware in the Netherlands. Only one I found was ukhammocks.co.uk, but they are usually out of stock, and due to the price of the pound/dollar, it is probably cheaper to order directly from Dutchwaregear.
Send me a PM, maybe we can work something out with combined shipping, I have been looking at a new whoopie suspension myself...
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