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I have done it before, yes in some cases its that simple, I have pulled the last IF tube and just injected a composite video at the output of the dector, and the audio to the grid of the audio amp. Sometimes it does not work so well, maybe a phase inverter needed or just not enough signal for the gain of the video amp. I often use this approach in trouble shooting to isolate the pic issues.
I have considered it as a perm way to deal with the lack of OTA transmissoins and have come to the conclusion that its better to just work out the issue with the RF/IF and use a modulator, A well setup and aligned front end works fine, and some how I feel I am "cheating" if I ignore half the tubes or more.
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