Hello G,
You could try some form of jar opener....
https://www.ebay.com.au/itm/Multi-Purpose-Opener-Jar-Lid-Bottle-Cap-3-In-1-Grip-Twister-Rubber-Opener-1998/232321562741?epid=561936923&hash=it em361771b875:g
ncAAOSwiDRd2eTn
or adjustable oil filter wrench of the rubber band type
Given the thinness of the adapter, you will have to fiddle with the location of the tool somewhat.
Good luck
Best
JA