Sure, but the fact that it is a
dead key (on some/many layouts) has nothing to do with its original
choice as AHK's escape character. That's just a coincidence, I would suppose, which of course rather complicates things on
dead key layouts when sending an odd number of literal
`s.
Then, an additional space (or other character) is required, except for
text mode which could probably provide a layout-independent solution for inserting literal backticks.
Since the OP wants 6 literal consecutive ones (if I understand correctly),
Send "{`` 6}" should even work with a
dead key. Otherwise, for an odd number like 1 or 5, I would probalbly add a trailing space.
Not sure if Chris Mallett even cared much about dead keys when he started AHK development, as there are none on the standard US layout.
Also, iirc, there have been a few changes or fixes re dead key behaviour over the years (at least in v1, which surely were reflected in the contemporary v2 versions).
edited