Very interested in this thread as I have been thinking of this for a while.
I have even got an MPR barrel stashed away that I have shortened on a previous project for my EV2. I was thinking of either silencing or shrouding it to make it a good all rounder, that can be used for HFT and rabbiting, and for practice in the garden.
I love my Steyr, but think a well sorted and shortened EV2 could be the ultimate carbine.
Keep us informed how you get on.