I guess you should be at a DDvorak forum then (if one exists)? Or ask Andrej (siteuri) - he answered well enough the last time I asked him something. Not to be rude; I'm just not able to use energy on helping users from every possible layout.

One of the many things I like about Colemak is that it has an actual community and therefore support; not as much as Dvorak but certainly more than most of if not all the personal layouts have.

I think the most straightforward way to do this is to just add a new "language" layout in the X11/xkb/symbols directory (or just add a few sections in one of the default ones).

that will allow you to create the basic layout and the AltGR+level3 layouts.

Not sure about how to assign the shortcuts and macro keys that way, tho...(you might have to use xmodmap) but it could be a start?

If you succeed in creating a complete implementation, be sure to post back.

g'luc