Hey dads, I need advice on how to save this growth chart please.

I painted this 25 or so years ago. The kids are adults and no longer growing. It's just something all by without thinking about it. Anyway, We are more or less empty nesters and thinking of moving.

My wife just asked me how I plan to save this. It's painted directly onto a structural beam, so I can't imagine it's doable.

I wish I'd have thought of it 25 years ago, and added a removable layer before painting.

She will be sad if we can't somehow reproduce it wherever we move to.

I guess I could just take accurate measurements and repaint, but that seems like cheating, and I'm sure it'll never look the same.

Any suggestions?