Um... you answered the only way to do that. Congrats. I really don't like being an ass about it, but sometimes it can't be helped.
From everything I've read in the past, it's not currently possible to rip XBLive! content from one xbox and place it on another, even when we know what files they are. At least I've not seen anyone posting about making it work.
And OXM is the only known non-XBLive! carrier of XBLive! content.
I'll suggest getting OXM, cause it's a decent mag, and the demos are a nice plus.