Why not go all the way with your proposal?
On a German layout keyboard (QWERTZ), the following characters are inconvenient to type: []{}\|. So your issue not only applies to regexes but to the language as a whole. A proper i18n solution would be required, where the German version would utilize the more accessible characters äöüÄÖÜ and ß instead. I am sure the productivity of the German Perl community would go through the roof. The Pörl community, I mean.
In the meantime, once the developers stop looking at Perl > 5.20 and Perl 6, and get around to implement localized versions of Perl, however called, I would like to advertise the use of UK layout keyboards which have all required characters in convenient locations.
(?: Just my two cents\.)