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Does a TV tube's use of magnetic scanning not present a considerable difficulty in using them in an oscilloscope? IIRC, a CRT television typically used some rather hackish special-purpose circuitry to linearize its horizontal and vertical scanning, each just at one specific frequency?

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The build I have seen was driving the electromagnetic steering coils directly, bypassing any original TV circuitry.

I imagine so, but you still have to deal with the underlying problem -- the coils are an inductive load -- and not just at one scan rate, but over all the scan rates you are using and at all frequencies in the signals you are displaying.

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