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Slapshot scripted Mirror Universe but noticed the AI won't use it. I was curious and checked the AI code and found the reason is that the Upkeep phase is not used by the AI at all:

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    public final void stackResponse() {
        // if top of stack is empty
        SpellAbility[] sas = null;
        if (AllZone.getStack().size() == 0) {
            sas = getOtherPhases();

            boolean pass = (sas.length == 0)
                    || AllZone.getPhase().is(Constant.Phase.Upkeep, AllZone.getComputerPlayer())
                    || AllZone.getPhase().is(Constant.Phase.Draw, AllZone.getComputerPlayer())
                    || AllZone.getPhase().is(Constant.Phase.End_Of_Turn, AllZone.getComputerPlayer());
            if (!pass) {        // Each AF should check the phase individually
                pass = ComputerUtil.playCards(sas);
            }

            if (pass) {
                AllZone.getPhase().passPriority();
            }
            return;
        }

If "|| AllZone.getPhase().is(Constant.Phase.Upkeep, AllZone.getComputerPlayer())" is removed, the AI will use the ability of Mirror Universe.

Is there any reason for excluding this phase?

Not really. It was primarily to reduce the amount of times the AI would try to activate abilities, especially ones it shouldn't be activating. I think the Upkeep should be fine to remove, especially for cases when the only time the AI can activate something is during that Phase.