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The only benefit really would be the ability to use the same mags as your handgun uses. Personally I'll stick with my AR-15 loaded with 31 rounds of SP .223 than a gimmicky rifle loaded with 16 or so rounds of JHP 9mm.
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I'm pretty sure that the sub2000 can take the 33 round G18 mags as well, so you can potentially get pretty good ammo capacity out of it. I wouldn't think that 9mm is going to penetrate any worse than .223. You can always choose a lower pressure cartridge if it's an issue. The advantage over a handgun would be that you should be able to shoot faster and more accurately with 3 anchor points than you can with one. Sort of a poor mans mp5.
But either way, the OP has the carbine and may or may not have an AR.
And, I think - assuming maneuverability of a long gun in general isn't an issue - the keltec should work quite well for home defense.