Rather than actually fabricating new tubes, I think a smarter approach would be to make a convertible circuit with adjustments and connectors that could revive

Rather than actually fabricating new tubes, I think a smarter approach would be to make a convertible circuit with adjustments and connectors that could revive any/most CRT's. So you could find any non-punctured CRT, gut all the electronics, replace with the add-on board, and fire it up again. The new circuit would have HDMI or breakout boards for any interface you want, IR, Wifi, audio, etc.