Found a sollution!
I’ve made two new text layers, pickwhipped the Source Text of the input layer and use Slice to trim of the unwanted character.
Probably not the cleanest method but it works!
For the character: thisComp.layer("SCRABBLE VARIABLE").text.sourceText.slice(0,1)
For the number: thisComp.layer("SCRABBLE VARIABLE").text.sourceText.slice(1)