Yes. I have done it before but it took me awhile. I spent each day talking to my 10th villager and fulfilling each favor they asked of me until they became friendly with me (i.e giving me stuff for free and sending me letters). Then they asked me to move just like all my other villagers, they didn't seem to want to move out until we were friendly with one another. You can do this pretty quickly if you TT just one day at a time look for the villager that is moving (one of your 9 villagers you want to keep) ask them to stay, then go to the newest villager (the one you want to leave) and talk to them until the get that thinking bubble above them. I don't suggest TTing more than a day or two at a time as you might accidentally put one of your other villagers in boxes. I hope this helps.