Now that interwikis are being provided via Cognate for Wiktionaries, /diffusion/PWBC/browse/master/scripts/interwikidata.py should be amended to allow removing the links from the pages. Now it displays as follows:
ValueError: wiktionary:gl does not have a data repository, use interwiki.py instead.
Or support interwiki.py to just remove all interwiki links. What do you think it'd be easier to do?