Okay, thanks for this information!
I have also already thought about alternative methods, but since they are both computationally expensive and visually unpleasing, they aren't real options.
The last thing I could think of was the following: As far as I understand, text gets rendered into pixel-based bitmaps during compile time, and the target device then "simply" copies the bitmaps to the screen whenever text is needed. If that is the case, could these bitmaps be somehow edited or replaced? Then it may be possible to add the outline manually as long as it stays within the bounding box. Of course this would be quite complicated to do manually, so it would only be worth it for a very small number of characters. But still, as a proof-of-concept it would be interesting I think.
Do You happen to know if something like that is possible?
