Hey @Evert — I unfortunately don't think this is easily accomplished out of the box. The table at the moment does not have a property to keep track of the modified indices after sorting by a column. We do have an outstanding feature request for this so I have gone ahead and linked it to this thread so we can keep you up to date as an update is shipped. In the meantime, the only workaround I can think of is a bit hacky. You could use a JS transformer and temporary state to keep track of the tables {{table.sort}} property and then generate an array of indices post sort. I'll attach an app export to this post for you to take a look at that should work for your use case here 
sorted_table_navigation.json (17.5 KB)