I can sing Twinkle Twinkle Little Star in numbers, thanks to a mini pocket piano (and accompanying instruction booklet) I got from Father Christmas when I was 6.
I sing it like this...
One one, five five, six six, Five,
Four four, three three, two two, ooonnne,
Five five, four four, three three, twwoo,
Five five, four four, three three, twoo,
One one, five five, six six, fiiive,
Four four, three three, two two, ooonnne
🤣