First I'll say I'm not back up to speed here on the latest developments.  But IF common flyback coils will be a problem because of internal diodes why not consider automotive hot coils or ignition coils?  Older cars have them separate without any other electronics in them and they put out easily 20KV from just 12 volts input and they are built to handle the constant arcing and sparking.  And they can handle higher current than most flybacks.  Easy to find in auto parts stores - I'm seeing around $25 new.  Easy to find in auto wrecking yards for probably $2 -$10.

Good idea, they would be available to everyone.
But unfortunately wouldn't work either without modification, because you only got the "hot" output available and in Stivep's group device you need the "cold" end to connect to the other transformer secondary.
If i remember correctly ignition coils have the primary and secondary connected, so it is kind of available, but not sure if it would work the same if you can put that thing into resonance in the same way.

@Mannix and @all

So what do I have to do with my flyback transformer? Tear it open and remove the diodes since the WNY device did not have any and there are none shown in the diagram that @T-1000 posted days ago. So I have to remove the diodes. Doctor Welby, we'll have to operate. Hmmmmm. Will it survive the trauma is the question? lol

Interlude.................10 minutes later........

Well I tried using a hack saw blade and started sawing off an edge of the circuit side of the flyback transformer, but there is no way you can do it. It is all encapsulated in epoxy. The only other way is to use a hot air gun and melt away the material. This is highly unpractical and will surely result in damage to the coil wires that will require reconnection. So this is not a good idea to use standard flyback with the WNY diagram.

The youtube I referred to in my previous post shows a circuit, shows it sparking, and is doing it with the standard flyback without any internal modifications or diode removal, so maybe we need to marry that to the WNY diagram. I have put his diagram below since this is one way to do it.

We already know TK did it in many ways starting with the green box inverter, with car battery start up, to his plexi unit with the 9 volt startup. These all confirm that the initial ramp up method is not important. So to see the differences in units, we know the initial ramp up can vary, so what does  not change. The TK coil. So all that before the TK coil is mainly up to what is practicable while the TK coil remains an unchanged method. 

Creating the first spark can be accomplished in many ways. Tesla did it in the Tesla Ozone Patent using damped wave pulsing via a rotary switching method and his device produced sparks that we call corona discharge producing ozone gas. @T-1000 mentioned that his first vacuum spark gap is useful to hold in ozone gas and u.v. rays. There are many ozone circuits out there today that can do the same thing. Also there are countless U.V. lamp circuits that use high voltage as well. Being in the water treatment business I have a bunch of UV circuits in the shop so I will take a few on Monday and see what can be done. I think I have an older ozone generator as well. Guys can just contact your local water treatment company and ask them if they would have a few ozone or UV circuits they would like to donate for R&D.

What I am trying to say here is that just because @T-1000 had an old flyback, it does not mean that is the only solution to the first spark.

wattsup

Having said that I'm not lacking flybacks and recently found this big one from a 60" Sony big screen projection TV I scrapped out.  My cat wants to know what the second part of this flyback is as it seems to have 2 parts to it.  The second part has two small wires going into the epoxy filled box and two high voltage wires coming out of it.  If you can tell me what that part is I'll pass it along to my cat