The "see-saw bleeder" as seen in 73, 1961 January, page 56, could help.
It does not require using the expensive PA or modulator tubes as a bleeder, which in the former case some people complain makes RF noise.
How about using a cheaper tube as an electronic switch? In the article the HV is left on and the load is electronically keyed along with the bleeder. In the article the bleeder resistor is electronically switched by a small TX tube like a 6146 or 807. The see saw bleeder appears in an unauthorized collection of old AM related circuits here
http://69.36.164.11/kb/goth/AGH-AM-027p.pdf (260MB)
Higher voltage tubes could be used, including Triodes. The reason to suggest that is because the circuit in the article may not completely cut off the bleeder at higher voltages depending on the 'idling' current of the switch tube. Tubes like the 4-65 and 811 can be held to cutoff at higher voltages than the 807, etc.