The idea of a 6BK4 in a monochrome DuMont is the ultimate feature for such a rare giant.
Give it a try once you're making HV, driving grid with an HV control and consider using a copier's HV power supply or another form of "tripler" circuit. 20kV is not hard to make this way.
Only in a DuMont would the Horiz sweep-only drive the yoke and provide the necessary blanking and keyed AGC
