Acute (and grave) accents as apostrophes

[jesus2099]

@sibilant

If it occurs in a pair, and the first occurrence is preceded by whitespace and followed by an alphabetic character, and the second occurrence is preceded by an alphabetic character and followed by whitespace or the end of the string, replace it with single curved quotation marks.

First occurrence is preceded by whitespace or start of the string.

But the problem is when there is combination of all these.

There is a good userscript for that.
It would be enough if Guess Case would replace agrave and acute with ASCII typewriter straight apostrophe.
Then the userscript can be used behind, like I often do:

Bookmarklet/Userscript to guess Unicode punctuation of titles

Hello “Unicode pixies”, during the last days there has (again) been some debate whether the guess case button could be enhanced to replace ASCII punctuation symbols by their preferred Unicode counterparts. As each ASCII symbol has multiple possible Unicode replacements, it is not easy to implement an automatic conversion. Another result of the discussion was that (even partial) automation could have more drawbacks than benefits if used by inexperienced editors. On the other hand I also believe…