/diy/ - Do It Yourself

Mountain Breeze anon here, I'm now looking to make an electrostatic precipitator which works on the same principles. For this I am going to need to generate 25-30KV steady non-pulsed DC as efficiently as possible. I see a few possibilities of generating this high voltage.

There are those cheap high frequency high voltage transformers rated for 20KV but I don't know shit on how to drive them and I've tried simulating them in kicad but it craps out at higher frequencies. I know that higher frequency = higher output voltage, but how do I design/tune the circuit such that it outputs steady 5KV (which I then can multiply)? I'm guessing I'm going to have to make a diy high voltage meter and make a tuneable high frequency circuit and then just figure it out through trial and error? How would you guys attempt doing this?
Here's one of them, of course no specs or anything:
https://www.aliexpress.com/item/1005003076138849.html

There are also those high frequency neon transformers that output 5KV 30mA. I could buy one of them and rectify and multiply that with high voltage rated diodes and caps.
Here's one of them:
https://www.aliexpress.com/item/4001090859869.html

Also, and idea how much power these high frequency transformers would draw? I'm hoping it would be as efficient as one of those mountain breeze units which simply multiply mains.