lets take a look at possible construction methods. There will be convenient places to put the taps on the HV winding. It depends on number of turns, so as to arrive at a tap point which is at the end/beginning of a layer. It may be better to divide up the voltage a bit diferently. The insulation will be better protected if we don't drag a lead across other turns.
I will contact Phil at Heyboer and see what he can do for us and how much it will cost. I will do the footwork on behalf of the group, as I have been dealing with them for a while.
regards,
Douglas