Traditionally we use a resonating or ringing ignitor and a beefy symmetrical LC low pass filter network at a minimum of 1/5th of the ringing frequency.
Find the "Cermax lamp engineering guide" by Excelitas as an example.
In my case I typically have 2 series Ls, one each in the hot and cold sides, Then some really beefy HV caps in shunt, one before the Ls and one after it, plus a blocking diode
STEVE