I had a pony growing up. It was a real live pony. Tossed me on my ass a few times too.
This is a little too weird for me. Sorry, dude.
Go find a real stable, take a lesson or two. Become one with the horse. Getting a 1200lb. Animal to respond to the lightest touch, squeeze of the legs, flick of the reins and knowing how he will respond (usually); It’s an amazing experience.
I'd only give him 200lbs, all suited up.