I found a way to do it
I think i misunderstood what Kush Friendly said, but here's what you have to do:
1.) Go on your CFW PS3 and install the 1.14 update PKG. (or let it auto download if it's connected to the internet)
2.) Open up a file manager. (I use Comgenie's)
3.) Navigate to dev_hdd0/game/BLES00683/USRDIR. (or whatever your MW2's regional ID is)
4.) Delete default_mp.self. (to do this in Comgenie's awesome file manager, hover over the file, press square then start.
That's all you have to do!
if you want to then go on and host, just install your chosen bypass patch with a file manager and data transfer to an up to date OFW ps3 and play to your hearts content. xD
Hope this helps someone else in the same spot that I was in. <3