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The challenges are entirely different, with impedance matching being at the crux, and preventing instantaneously devastating flashovers between the secondary coil and grid windings, or inside the big power oscillator valve.
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Ever considered a thyristor crowbar circuit? We used them on the Marconi B6126 HF transmitters to mitigate the effects of valve flashover. In fact, the valve manufacturer insisted we had such protection to offer valve warranty.
It consists of a current transformer on the 26kV HT reservoir capacitor line feeding an ignitron pulse unit (a thyristor alone would do your app) which, upon receipt of a sudden current pulse caused by a valve flashover, would open the a.c. supply vacuum switch and simultaneously (meant to be simultaneously...) dump the d.c. HT to deck via an ignitron.