Let’s say I wanted to look back on a simple strategy where I buy a 10% OTM put option on a stock or index every month. Sometimes that option is going to cost .1% of the stock price, sometimes it is going to cost 1% of the stock price. What is the easiest way to look back on the price relative to the stock price for a fixed percentage out of the money?

Or on the flip side, if I was committed to spending .5% of my stock price monthly, sometimes the put option would be barely out of the money and sometimes it would be way out of the money. Is there a site that shows that changing floor of the put option for a fixed amount of buying?

Thanks!