Boy, this one's the can of worms... you've opened yourself up to a lot of questions. I've got to say, though, that after owning a 2305 myself, I can see it not being the right tractor for someone else as well, not to mention the people that have chimed up on this site admitting to its shortcomings only after owning it for a while.
My father-in-law has an x585 w/ FEL and it wasn't until I really looked at his property that I realized it's exactly the right tractor for him. Lots of steep hills that I'd never go on my 2305. But, being younger than him and thinking I know everything, I'd have gone right out to the Deere dealer and would have bought the 2305 if I were him because of all the extra stuff I thought it could do over and above an x-700. But, I'd be trading it right back in for one of those after mowing his sloped lawn!
Reading this post, I think of all of those people on this board that have traded up from an x-700 series to a 2305, so it doesn't seem so far-fetched to me.
But, as jenkinsph said... finding someone close to you that wanted that exact trade is highly unlikely. Not impossible. But, doubtful. If it were me, I'd go right to craigslist and try to sell my 2305 outright. After all, that's what I did and only lost $1000 in cash on the deal. It sold in 2 days. Hope you're able to find the right buyer and right x-700 to replace your current tractor.