Sure, simply use a keg to lager the beer. don't carb it, just let it lager as you would when it is in a carboy. The beer will never know the difference.
Yes, I use the same fridge for chilling kegs and for lagering. My fridge (conceivably) holds as many as 30 kegs with room for a dozen or so carboys. But I at most have 6 kegs full kegs and 2 or 3 carboys at any given time.
On Tap: 1. Kelly R. IPA, 2. Roter Hund Hefeweizen, 3. Bud Killer Blonde, 4. Red Dog Pale, 5. Roter Hund Oktoberfest, 6. Pumpkin Ale, 7. McRed's Stout (with new nitro system and stout tap,) Cream Soda, 8. ESB # 3, & 9. Ordinary Bitter.