Prussik tied to the corner in the manner cmoulder did accomplishes what you asked.
I've given up on prussiks.. I hate prussiks...
I am fan of the mini ucr as well. Pictured below on the doors of my Superfly. They were also on the ground corners of the Superfly and Mamajamba. These have micro cord threaded through them because it was the doors. The ground corners used Zingit until recently when I changed to Z-Line.
The last photo above shows them ready to be larks headed to the corner hardware, but they still need a small whipping knot just before the overhand knot on the left or they will slip.
To see how to make them
go here, and scroll to about page two or three. Or jump to the end. The mini ucr keeps the adjustment point at the tarp corner which was one of your (OP) requirements. I have a fixed eye in the stake end and two barrel knots about two inches apart at the other end so if the guy line get sucked back into the ucr, the knots prevent the line from slipping out and the also create a little tail to grab.
The main advantage over prussiks, in my opinion, is that the ucr never binds up. Just pull your guy line tight and milk the ucr body down to lock it in place or slide the ucr body up and releases in a flash. Yet, they hold like pit bulls once set. It tightens and releases super easy, and if you thread the end of your guy line through the corner hardware you can have a 2:1 mechanical advantage for tightening.
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