Personally, if I were trading for myself, I'd just sell crash puts. Logic is simple:
(a) Crash is way overpriced due to new regulations and economic capital requirements. E.g. desks are forced to cover all sort of unrealistic scenarios like -20% and -35% down gap in index as well as +50%/-50% gap risks in single stocks.
(b) The usual players like funds have consolidated and now vol arb PMs are not really allowed to sell crash risk. Some of the old semi-instututional players (like MMs) have had their crash limits reduced after 2008 and further after 2011.
(c) As a retial trader, you are not really tied to any performance metric or risk managment limits aside form those implied by the margin calculation and your own. Of course, the return profile is still typical to risk premium seller (that is, you might have some bad years and definitely bad months). However, if you size-up your crash risk intelligently, you can achieve very nice risk-rewards.
(d) You do need portfolio margin for this, otherwise reg-T will limit your yields. Other nessesary bit is to keep up with banking/risk regulatiory environment to understand how banks are forced to cover their crash risk.