Keyboard remap: home → comma, end → dot

Question

I'm trying to change xkb settings in this file: /usr/share/X11/xkb/keycodes/evdev. Specifically, I tried this:

    // <AB08> = 59;
    // <AB09> = 60;
    // <HOME> = 110;
    // <END> = 115;

    <HOME> = 59;
    <END> = 60;

    <AB08> = 59;
    <AB09> = 60;

(I tried all three combinations, i.e. map all of them to 110/115 or map home=59, end=60, comma=110, end=115). In neither case I can get both . to print dot and End to print dot.

The commented combination is the original values.

I'll admit, I don't understand how this mapping works. I thought I did, but now it doesn't make any sense any more.

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In case, what I'm asking for wasn't clear: I don't need Home and End (I'm using Emacs, and the functionality of these keys is implemented differently), but on my keyboard these keys are in the premium space, so I would really like to use them for something I use a lot: comma and dot (which on my keyboard are difficult to press).