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I agree with what Electronic M said.
Tripplers contain capacitors and diodes. The diodes and capacitors have a maximum voltage they can withstand. Diodes also have a limit on the maximum current they can handle. The capacitors have to charge through the diodes and the charging current depends on the size of the capacitors as well as internal resistances in the devices. The bigger the capacitors the more current the trippler can output but also the charging current is higher.
Flybacks can only output so much current, I doubt even a color flyback could stand more than 1.5 ma without burning out. You can't reliably predict how much voltage and power a flyback can handle by the size of the secondary winding. The cross section area of the core also limits the power. Even the frequency the transformer is operating at effects the output, the secondary is actually operating at much higher frequency than the 15,750 Hz horizontal because it is a narrow pulse.
The flyback circuit is something that evolved over time for one purpose and the design is complex. Neon sign transformers are simpler as is another device called a oil burner ignition transformer (those are probably harder to find). Still another idea is an old automotive ignition coil and transistor drive circuit. You could build you own trippler circuit using parts that you know the specifications on with the alternate transformers. Do be VERY careful with these HV supplies, they can be lethal.
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