Is it possible to run rclone union, with 4 or more backends, while doing random reads on the backends, unless file is on local vfs cache?
You could try making a union of unions...
So the top level union has a union of local, and the backends union.
The backends union is a union of the 4 backends.
I think you could then set the policies of the two unions to do what you want.
That sounds like a lot of layers that would reduce performance 
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