[RMVX] CHANGE TEXT COLOUR MID-SENTENCE WITHOUT DRAWING EACH CHARACTER SEPARATELY?

For the most part I'm pretty good with RGSS (I'm getting paid for it so I must be doing something right) but I've hit upon a slight snag with one of the scripts I'm working on that I'm not sure how to tackle.

There's a window in my scene that has a string of text, but I need part of it (which is variable) to appear in a different colour from the rest. I considered separating the two parts and drawing them separately but then the positioning goes off when the variable value changes.

Anyone know if there's a way to change text colour mid-sentence within the same draw call?