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<apex:page id="test" sideBar="false">
    <apex:includeLightning />
    <body class="slds-scope">
        <div id="omniDiv"></div>
    </body>
    <script type="text/javascript">
        (function() {
            window.addEventListener("internalapievent", function(evt) {console.log(evt);});
            // Script to inject Lightning component into the Visualforce page
            $Lightning.use("c:omniHelperApp", function() {
                $Lightning.createComponent("c:omniHelper", {}, "omniDiv", function(component) {
                    console.debug(component.find("omniToolkitAPI"));
                });
            });
        }());
    </script>
</apex:page>

<aura:application access="GLOBAL" extends="ltng:outApp" description="omniHelperApp">
    <aura:dependency resource="c:omniHelper"/>
</aura:application>

<aura:component description="omniHelper" implements="flexipage:availableForAllPageTypes" access="global">
    <lightning:omniToolkitAPI aura:id="omniToolkitAPI" />
    <lightning:workspaceAPI aura:id="workspaceAPI" />
    <lightning:button label="Try stuff" onclick="{! c.tryStuff }" />
</aura:component>

({
    tryStuff : function(component, event, helper) {
        console.log("omniHelper::doInit");
        var workspaceAPI = component.find("workspaceAPI");
        workspaceAPI.isConsoleNavigation().then(function(response) {
            console.log("omniHelper: "+response);
        }).catch(function(error) {
            console.log("omniHelper: "+error);
        });
        console.log("omniHelper::doInit done");
    }
})

omniHelper.js:11 omniHelper::doInit
test:31 CustomEvent {isTrusted: false, detail: {…}, type: "internalapievent", target: Window, …}
omniHelper.js:18 omniHelper::doInit done