If the barrel is metal you can do that, and if the ptfe tube melts, I'd just replace it. It's not expensive.
PLA is difficult to drill but it will get soft easily at lower temperatures. You could also use boiling water to soften the PLA, the ptfe will survive 100 degrees. While it's not melting it may get soft enough to get it out using a thin wooden stake or something that doesn't damage the barrel.
If PLA gets too hot it will turn into unmeltable solid piece, you'll need to burn in out. That will be more difficult than making it soft enough to coax it out.