I know on the dB2 IPs you could break out the check ball as a get you home fix but the IP was in it's death throes and coming apart internally which is what caused the clog. I doubt it would hurt anything to remove the fitting and cycle the LP.
I had actually seen that before. They did the repair to a very rare block. It wasn't as simple as just welding it up. The whole process took a couple of days. Then there was quite a bit of machining to do.