At this point I'd just try to strain it into another pot. You'll be fine.
I've done this several times and it's never messed anything up. After several of these experiences I am a die hard Rice hull fan now. They work really well.
Yeah - nothing worse than a stuck sparge. Except maybe an infected batch of beer.
At least you got through the mash and 1 washing before it stuck! That's a plus! When it sticks on the first runnings you know you're in for a long night.
Stirring typically helps but when that fails I always just open the valve and blow through the tube lol. Not the most sanitary method but it's pre-boil so who cares.
I've never had that work for me. It usually unclogs, but then it clogs right back up after a few seconds. That, and the chance of scalding my lips with 160F wort makes me a little nervous.
I've used an air compressor before to blow back through the valve sharply and this has blown out the stuck sparge and usually doesn't get stuck again. Just make sure the lid is loosely covering your tun when you do it.