West European-specific characters for virtual keyboard

[Louvre]

The english keyboard has at least 17 characters (signs and numbers) already present in the Russian keyboard. They could be replaced by letters missing for German, French, Italian, Spanish (and more) users. Or a third keyboard could be added.  See here for Western Latin character sets.

Lower-case (minuscule) letters vital for French (and some of them also useful for German, Italian and Spanish):

Modified a:  U+00E0 U+00E2 U+00E4

Modified e:  U+00E9  U+00E8 U+00EA U+00EB

Modified i: U+00EE U+00EF

Modified c: U+00E7

Modified o: U+00F4 U+00F6

Modified u: U+00FB U+00FC

e inside o: U+0153

e inside a: U+00E6

Vital for German:

Double s (eszett): U+00DF

So with these 17 small letters you have French and German covered. Do we need the upper-case (majuscule) versions of these letters to be coded as well, or can these be coded to mean both lower and upper-case letters in the searches performed by the virtual keyboard?

I will add the Italian and Spanish later.

But already, the english keyboard could cover three languages instead of one. And be more useful for more countries and people learning those languages.