One obvious extra language is Whitespace with anything that doesn't require indenting.
And maybe Fortran's fixed form could also be useful: first 5 chars are labels and anything after 72 is ignored ( info ).
Combining Javascript and Typescript, or even Python 2 and 3 or pypy, is considered cheating I guess?
I guess you could do something with //, which is a comment in some languages but integer division in others...
I don't have time to make something right now though...