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Anything is possible if you can isolate the right piece of code and modify it.
It is certainly possible to make a center/center block with a horizontal menu. In the templates for the multi-menu block you would need to change the code that causes each entry to start a newline, to one that creates a small space. You would need to be careful not to have too many items, and watch the item title length.
I am certainly confident that it could be done.