One last thing I forgot to ask – how do you want the categories on your site’s filter sorted out? Can you please elaborate?
What you want will require a lot of custom coding which we do not support unfortunately. The best we can do is add arguments to the current sorting function, which means there is no “custom” sorting for it.
You can try to search for other plugins that can help you with such ordering. The plugin @traubinger suggested only works with first-level categories based on the tests I did.
This will require a number of code changes to the theme, so the best option is to use the https://wordpress.org/plugins/taxonomy-terms-order/ plugin to make it easier for you to sort out the filter items.
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