I don’t know if this is viable - but a lot of smaller businesses who don’t want to spend $20 for a Pro Plan yet may be interested in a Junior Plan at $5 or $10.
Could be restricted to only run for one page i.e. the home page. All small business want their home to load quickly.
Could just include one or two features i.e. Mirage and limited Image Resizing would be useful, in my case, for making a home page load faster on mobile.