There was a script for this, but I haven’t gotten it working recently. You can give it a try though. Wanikani Later Crabigator:
You can chat with the scriptwriter as well, if you can’t get it working correctly, so see if there are any solutions.
But, you can also as you say fail any item temporarily. You don’t have to live with the results of that. Just keep on reviewing until you feel like you’ve done enough items - then close your tab or browser mid-session. that will reset the answers you’ve given for items you have not completed both answers for. So, you can get back to those items at a latter date.