Yes, High Voltage Resistors are Expensive.
But I have some of them Also, Made by Dale/Vishay.
But the use of these Also Reduces the Output Current.
The Diodes I have are rated at 24Kv and 2 Ma Continuous.
10 Ma Intermittant. Part Number SHV-24, Made by "Sanken".
And I can sell them Fairly Cheaply, I have about 1000 of them.
Email Me if you want more info.
Include Quantity and Where you Live, (Country) so I can Include the Shipping cost.
Trade, Maybe??, Depends on what you have in mind?