you need to find someone with access to these pools who can directly push it to them. i know of two people: Quickseller and macbook-air having access to F2Pool and may be able to do it for you for a fee.
give CPFP (Child pays for parent) a try first though. i don't think it works but it is worth a try. the problem is that they have to see your transaction already and ignore it (have it in their mempool) for it to work. but we don't know what settings different miners have. some may have minrelaytxfee set at 0 still.
quick explanation: you basically spend the unconfirmed transaction but pay a fee that covers this unconfirmed one and the new one that you create. a miner seeing them will pick up both and put it in a block they find to get the fee.