[Electronic M]

It should be possible. You may have to trick it into recording by feeding it a test pattern. Here in NTSC country VHS HIFI has better fidelity and response than CD audio. A little over a decade ago a radio station I liked and soon was going to move away from was doing an A-Z weekend and I decided to record it. Audio cassettes were cheap and my reel to reel could record 4 hour blocks if I was going to be away for more than an hour cassette, but how to get a good night's sleep?...Well plug the video output of my Nintendo 64 and the audio output from my reciever into my VHS deck, stick an 8 hour VHS tape recording at EP in and conk out for ~8 hours...it worked like a charm. The audio was better than the purpose made audio tape formats I used during the day.
You can get small cheap test pattern generators or old game consoles to fool it into thinking it has video easily enough if you look for some.