The only argument against this that I can think of is that the market could continue to go up and up, and your premium gain might be less than what you'd gain through regular DCAing or lump summing in.
However, one adjustment if you have a bullish outlook is to reduce the delta from 30 to 20 or 10. Premium would go up and assignment is more likely.
OP, do it and report back :-) Even if you don't have any options experience, I am sure any broker will be happy to give you level 4 options (or at least level 2 which is what you need for cash secured puts) if you deposit $450k capital!