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That's a built in limitation of "use values from field" value lists. The indexes involved are always sorted in ascending order and thus the values are also.
I suggest that you consider using a selection portal inside a popover in place of a value list. The records in a portal can be pretty much sorted any way you like so you avoid this limitation. Using a popover means that the selection portal need not take up any more layout space than a drop down list or pop up menu.
There are a number of working selection portal examples to be found in the following file. Each example comes with detailed information on how they work and how to set them up: