Features

Default US keyboard with all Czech diacritic characters with GrAlt

Quickstart

copy scprog to /usr/share/X11/xkb/symbols

sudo cp ./csprog /usr/share/X11/xkb/symbols

Add next code to "/usr/share/X11/xkb/rules/evdev.xml", put it into tag "layoutlist".

<layout>
    <configItem>
        <name>csprog</name>
        <shortDescription>en</shortDescription>
        <description>English US, AltGr for Czech symbols</description>
        <languageList>
            <iso639Id>eng</iso639Id>
            <iso639Id>cze</iso639Id>
        </languageList>
    </configItem>
</layout>

Reboot the system.

Add keyboard called "English US, AltGr for Czech symbols"