Oof, that's rough. I rounded a bolt on my bleed port screw and while extracting it managed to strip a few of the threads too. Fortunately I have just enough thread left to engage the (new) screw and I've not died yet. As long as you have a few threads left you should be ok.
Any bodges for a stripped ultegra r8070 bleed port - not the screw?
Help! :(
Edit: I've just bought a hot glue gun...