This is a new shoot, right? Recently released?
Some of your write up talking about what Greg is saying rings true or mostly true. Some of what Greg is saying is a festival of BS and mis-rememories.
This one, for example, is a little of both...
"Gagne claims the High Flyers were put over Baba and Dory Funk Jr. in Japan as part of the World League Tournament. (Wrestlingdata.com has Dory and Greg’s only encounter being a Pro Wrestling USA battle royal)"
Gagne and Brunzell did compete in a tournament in Japan in April of 1984, and Dory and Baba IIRC were a team in that tourney. I believe Dory and Baba beat them, though.
Dory also teamed with Kerry Von Erich against the Flyers on the same tour and that match made tape. Flyers lost.
The Hansen story with the chair is possibly true, the Flyers did meet Hansen and Brody twice in that April 1984 tourney but neither match made tape. One went to a no-decision of some sort, and Brody/Hansen went over in the other match IIRC.
There is an interview segment from 1984 AWA TV with Gagne and Brunzell holding a plaque from that tournament, with Greg talking about it. It's not more than a participation memento, though. It was just a little 4-team mini tourney from memory.
Looking forward to getting that shoot (and picking it apart lol), sounds right up my alley.