Some tow poles just about clip round the narrow part below the tow ball but I guess you've looked at that.
Can't you pull the bolt out the tow eye hole and put the tow eye back in? Assuming its a detachable screw-in tow eye.
Or maybe you could take the tow hook off the trailer and fasten that to the end of the tow pole, there is usually a convenient through bolt the pole can clip onto, then if necessary rope round it to make sure it doesn't flip...... Heath Robinson rules!
In a time of universal deceit - telling the truth is a revolutionary act. George Orwell
When the debate is lost, slander becomes the tool of the loser. Socrates