Simple solution - declare the property as a vacation home. Continue to take cash.
We previously owned rental properties many years ago. We took all the rent payments however the tenant wanted to pay - cash or check, gave the tenant a receipt and reported all the rental income on the tax returns. It did not require any “electronic” system.
I cannot say that all rental income property owners were doing the same, but my perception is we in the U.S. did not have a culture of tax evasion on the issue.