I was recently looking for someone without a horse of their own who wanted to ride and show my (very) green large pony. I’d haul them to shows and lessons, pay for some of the shows myself, and in exchange they’d get to ride as often as they wanted and do 20 to 30 minutes of barn chores a few days a week.
I was literally laughed right off the internet.
This is how I rode while I was in college so I guess I assumed people like me (poor adults who wanted to ride) still existed.
For me, I feel like your arrangement would work minus the mowing/fence repair/picking things up. There was a period where I separated from my ex where I really struggled to make ends meet let alone keep my horse and an arrangement like this would have been perfect.