Now great minds think alike! I thought a controlled burn would be ideal, but thought better of mentioning it.My first thought would be a propane tank w a weed burner wand, but it sounds like this would only work in cooler times of the year w damp windless conditions to keep down the potential for brush fires, so that won't work.
I like the tarp idea. Can the tarp(s) lay in an area where you don't train for a period then you move it / them systematically.
No grandkids to help out? 🤩
I would love to see a current situation picture to see extent of his issues.