Extending beyond canvas?

I need to do this, and slightly more:

Will it work ok? Can I increase the canvas?

I can’t just scale everything, because my font is already established at a certain point size. Just for explanation, I need to do this sort of thing:

Update: no, it doesn’t work. When I try to type these characters into an external program, the glyphs cut off around 11,000 units to the right.

Is there a way I can change this behavior?

There are obviously limits. According to the specs all points must be within the range -16384 and +16383. However that is no guarantee all renderers can copy with this. For example Word chops of everything outside WinAscent and WinDescent. Too many points can also cause rendering issues, e.g. the outline will not be shown at all.

One solution to your problem could be a multiple substitution rule, so you split the glyph up into two or more glyphs.

Oh, hmmm… how would that work exactly? I haven’t used multiple substitutions before and am not clear on how exactly to do it.

EDIT: I figured it out. Pretty straightforward. Thanks!