No
Hesco and Amvac in the catalogs I got from henry vacuum sold items like this.
It wasn't Kirby but various companies sold them.
The K I imagine was only thing they could put on a bag without getting in trouble with Kirby.
Have you noticed a green pistol grip handle among other things.
Commercial vacuums didn't have a good setup for disposable bags yet. The lady commercial vacuum in 1984. The Hoover, eureka, royal etc all used f&g. I believe they wanted to keep costs low while using the vacuum.
Les