Any brokers offer long LEAPS with 75% margin? What about with a covered OTM call? I recall reading a while back that the regulators now allow this, at least the former.
Margin:
For purchases of puts or calls with more than 9 months until expiration, deposit / maintain 75% of the total cost / option current market value. When time to expiration reaches 9 months, the option no longer has value for margin purposes. Purchases of puts or calls with 9 months or less until expiration must be paid for in full.
From CBOE SPX Leap - no retail broker is equipped to offer it, because they will need to be hand calculated,