There are tons of good ways to hedge the risk of inflation, but if the stock market is a mystery to you then these ways would be a level of abstraction well beyond that mystery. We're talking options contracts and stuff...
It doesn't sound like you have a lot of time to read classics like
A Random Walk Down Wall Street or
The Millionaire Next Door, or even JL Collins' stock series:
https://jlcollinsnh.com/stock-series/ so it seems there is no way out of the money market account. This is a big problem.
Could the key be to hire an employee or two who could help with the gruelling hours and stress? Yes, it's an upfront investment, but look at it this way:
1) It'll free up some time for you to do diligence and make an investment decision you can be comfortable with.
2) Hire the right people and they might take over much of the day-to-day running of the business. Tim Ferris has some things to say in
The Four-Hour Workweek. If this worked out, it could negate the need to sell the business, give you more time to get the best possible price for the business, and give you a much better quality of life for the next few years. The outcomes to avoid are liquidating the business at no value or having a heart attack.
3) Hiring help is probably the key to the continued growth of your business, which is key to its valuation, which is key to you retiring. How much better does 1-3 years sound compared to 3-5?
4) In the much-feared scenario where an employee does not work out for whatever reason, you get to write off the expense and save on taxes.
Next item... If I was saving 200-300k/year and living a mustachian lifestyle, I would not worry about inflation. E.g. if your expenses are $50k/year and inflation goes up to 4%, how does that extra $2k compare to what you can save in a month? Cross that bridge when your NW exceeds 25X expenses.
Last... a small portfolio of commercial properties probably has a much lumpier and unreliable cash flow than, say, a more diversified portfolio of stocks, bonds, REITs, preferreds, etc.. Water line breaks, multi-year vacancies, and lawsuits can wipe out massive amounts of wealth as surely as market corrections, and waiting them out or re-balancing is not an option like it is with market corrections. Meanwhile Amazon and the WFH trend are decimating demand for retail and office properties - which are looking increasingly obsolete.
TL;DR - To me this sounds like a much riskier plan than just retiring at a 3.5% to 4% withdraw rate and an 80/20 portfolio.