Would the Countryman take a line level input? Or only instrument level? (couldn't quite tell from a quick look on the site and figured I'd ask first).
I've been wondering the same, but I'm a little more limited given I'm intending to use the stereo send as two effects loops. Means I need to look at the main outs, and probably use one side to go to FOH, and the other side to go to my amp. Meaning I'll likely be sending an instrument level signal out (and a DI like the Countryman might be a good idea), and I'll look to make my amp/cab as clean and flat as possible so I can run the amp/cab sims directly into it, as I can't turn off/route amp sims on one side of the main outs.
Just makes it a prick of a thing if I turn up to a gig and can't use my amp/cab...
EDIT: Actually, if this was the case, I'd just write a second set of patches without amp/cab sims, and go the traditional amp/cab route, having the FOH send come from the amp DI. Not ideal, but it'd work