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So there are actually two parallel VIF strips operating at the same frequencies but with differently-shaped responses in stereo RCA models?
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Yes, at least back in 1984 to 87 or so. I haven't looked to see what they did after that (GE bought RCA and raped and pillaged the Lab
and I got rif-ed). Other manufacturers used SAw filters with two outputs, one for the video VIF and the other VIF for the sound. Same freqs but different responses. IF amps are cheap now, just an IC then and now.
A tube VIF for sound would not need as many stages of gain like a tube color TV VIF for video would need. You might be able to do a "Madman Muntz" cost reduced VIF for the sound, as you can get the gain up with peaking on the picture carrier and the sound carrier and ignoring the rest of the bandwidth of the TV channel.