A NBFM spectrum looks a bit like AM, not SSB. It has a carrier and two sidebands. When I first started haming on VHF I interfered with my parents TV so tried FM (almost everyone else used AM - there wan't much SSB on VHF back then). All the AM guys had no problems listening to me on their AM receivers. They had to tune slightly off frequency so the frequency deviation produced and amplitude deviation at the edge of the IF filter, I think.
The same won't work for SSB/FM - the spectra are totally different.
Keith