The only reason I'm a member of the NRA is because I'm a member of the ENGC. (I am a lifetime member of the SAF and an annual member of GOA also)
I only stated NRA because that's the only nationally recognized pistol class I'm aware of. I believe there are more than a few certified instructors on this site who have classes that supplement their income. I am not one of them. However, the NFOA replacing their classes with free ones will certainly take money from their pockets. I didn't think they would agree to voluntarily give that up.
Perhaps you have already convinced enough of them to donate their time and money for the greater good (and the NFOA) I just find that somewhat incredulous. Maybe a one time thing, but that would be all.
I had thought of a workable idea though.
Business cards printed up with the NFOA logo on the front and the 4 rules of safe gun handling on the back. Perhaps with the advisement "Know the Law" under the NFOA logo. These could be given out to members (at the Gretna get together with plenty of extras to Shooter for gun shows)
If every member who wanted some got 10 or 15 it would both promote gun safety and the NFOA.
I don't know how much a box of raised letter, glossy cards would cost, but I'd put in the first $100 to get 500 made up.