That's a terrible pinout for differential pairs with that connector. I feel your pain.
Yes, you can add the accordion, but only manually after the pair has been routed. The smaller grid you use, the easier it will be. I should mention I route all of my differential pairs manually, and can offer no help if you want to do it with the autorouter. I do all my length matching manually using the spreadsheet view for length checking, and for complex topologies, an actual spreadsheet.