[myrroddin]

That looks confusing to me.

You can blend Ace3 and vanilla WoW code easily enough.

function Currency:OnInitialize()
    Currency.eventFrame = CreateFrame("Frame") -- OnInit only fires once, so creating frames and setting their parameters here would be a good idea    
end
 
function Currency:OnEnable()
    -- mimic AceEvent without the callback or extra arg
    -- basic functionality, but it works
    -- you also gain RegisterUnitEvent yay!!
    Currency.eventFrame:SetScript("OnEvent", function(self, event, ...)
        Currency[event](Currency, ...) -- notice the change on this line?
    end)
 
    Currency.eventFrame:RegisterEvent("SOME_EVENT")
    Currency.eventFrame:RegisterEvent("ANOTHER_EVENT")
    Currency.eventFrame:RegisterUnitEvent("PLAYER_EVENT", "player", "target")
end
 
function Currency:OnDisable()
    Currency.eventFrame:UnregisterAllEvents()
end
 
function Currency:SOME_EVENT()
    -- do something
end
 
-- etc
-- etc

Here are some issues I have with your InitObjects()

• It is not a local function, but should be
• You have some things in there that should be done only once, like creating frames, which is presumably good, yet there are other things that ought to be handled multiple times like registering events
• Nothing wrong with having your event handlers inside that function, but it doesn't look easy to debug in a year or two