I use iPad and pencil for mobile. The finger controls and playing on iPhone suck for me too.
Am I reading this right that you purposely broke your own arm to avoid playing the piano? If so that is hilarious

( except the broken arm pain and your parent(s) paying for it.

)
Not a direct choice, but I was very directly involved in the broken arm incident where I could have avoided it at any point. But there are
those days.
Those days when your brain decides not to be good. Actively making the situation worse when you really don't do that kind of thing. But those days happen on occasion and well... sometimes you gotta learn the hard way to control yourself even on
those days.
But hey you get a broken arm outta it and thus no longer need to squander time on your lack of musical talent and motivation. Win!
By the way, there was no pain. Just a feeling like "that's NOT right." Really not right. And you go find your Mom and drive to the hospital and nothing hurts yet and you get concerned why it doesn't hurt. This is supposed to hurt, right?
It doesn't hurt.
!!
But then the radiologist needs to take the X-rays and they gotta position your arm this way and that and the hurt starts making up for lost time. "Caregivers" they say. Hmmm... Yes I know they needed to do all that but
HMMMMM......
And then Mr. Doctor says, try this procedure.
I do the damn procedure! It's easy but as it was a humerus break (insert your favorite joke here), you "set" it with gravity, literally drop the bottom of your arm and it falls into place. So I do it and it works. Pain is gone. Arm is straight(ish) again. And wrap it with an Ace bandage to a rigid L made of some cast-adjacent material.
But
But
Wanna hear something cool? Only
slightly gross, but cool?
I quickly learned as I had a clean break that I could rotate my upper arm in place while the rest of my (lower) arm wouldn't move. Rotate arm, no movement. Cool and gross, equal parts! Until one day I could feel the slightest resistance and never tried it again. I learned after that bone healing starts with creating a viscous liquidy-substance and that's what that resistance was.
The body is a cool thing.
And occasionally gross.